Hello,
There seems to be an issue with Magento 2.3.4 , the caching system and the template.
Once the eav, collection and config are enabled, the color swatches are referencing the wrong products and some of the color variations disappear.
We applied to the patches included in the templates : it didn't changed much.
We opened a ticket before and provided some credentials to login the website. It was closed and we didn't hear from your developper.

This is a very urgent issue as the speed of our website is crucial to our users . Could please respond ?

Hello, we are using digital ocean as hosting platform. Could generate a ssh key - following the instructions here - and let us add you to ssh keys configuration files ?

Hello, 

thanks for the reply. 

I've included to pictures from prod and staging to explain the issue. On prod - the first picture the collection, data & eav cache are disabled . All of the swatches are displayed.
On staging - all the caches are enabled and the cache is cleared - some swatches are missing .

On a side note, one of our developers developed a custom module which is here

/var/www/html/magento2/app/code/You/Outofstock . it has a 

/var/www/html/magento2/app/code/You/Outofstock/view/frontend/web/js/product_status.js file 

which has the following code . does it conflict with your theme 

define([
  'jquery',
  'underscore',
  'mage/template',
  'mage/translate',
  'priceUtils',
  'priceBox',
  'jquery-ui-modules/widget',
  'jquery/jquery.parsequery'
], function ($) {
    'use strict';

    $.widget('product.status', {
    options: {
    },
    _create: function () {
        this._bind();

    },
    _bind: function() {
        var options = this.options;
        var select = $('.swatch-option')
        var id = $('[name="selected_configurable_option"]');
        var selected_configurable_option = $('.swatch-attribute');
        var self = this;
        setTimeout(function() {
          self.setSwatchStatusOnLoad(options);
        }, 2000);
        jQuery(document).on('click', '.swatch-option',function(){
              let product_ids_selected = self.getProductIdSelected();
              jQuery('div.swatch-option').removeClass('out-of-stock');
              self.setSwatchStatusOnLoad(options);

              if(product_ids_selected.length > 0){
                let product_id_selected = product_ids_selected[0];
                if(typeof options[product_id_selected] !== 'undefined') {
                    if (options[product_id_selected].is_in_stock == 0) {
                      //  self.addStatusToSwatch(options);
                        self._toggleShow(0);
                    } else {
                        self._toggleShow(1);
                    }
                }
              }
              else{
                self.addStatusToSwatch(options);
              }
        });

    },
    setSwatchStatusOnLoad:function(options){

      let attributes = jQuery('[data-role=swatch-options]').data('mageSwatchRenderer').options.jsonConfig.attributes;
      var product_id_index = jQuery('[data-role=swatch-options]').data('mageSwatchRenderer').options.jsonConfig.index;
                let out_of_stock_option_ids = [];
                let in_stock_option_ids = [];
      jQuery.each(attributes, function(attribute_index, attribute){
          jQuery.each(product_id_index, function(product_id,attributes){
              let option_id = product_id_index[product_id][attribute.id];
              let option_div_id = "option-label-"+attribute.code+'-'+attribute.id+'-item-'+option_id;
              if(options[product_id] && options[product_id].is_in_stock == 0){ //Push to out of stock array if not exists in instock array
                if(!out_of_stock_option_ids.includes(option_div_id)
                && !in_stock_option_ids.includes(option_div_id)  )
                out_of_stock_option_ids.push(option_div_id);
              }
              else{ //Remove from stock array & push to instock array
                if(out_of_stock_option_ids.includes(option_div_id)){
                  let indexOfOptionId = out_of_stock_option_ids.indexOf(option_div_id);
              out_of_stock_option_ids.splice(indexOfOptionId,1);
                }
                if(!in_stock_option_ids.includes(option_div_id) ){
                  in_stock_option_ids.push(option_div_id)
                }
              }

          });

      });

      //To grey out the out of stock swatches
      if(in_stock_option_ids.length > 0){
        jQuery.each(out_of_stock_option_ids, function(out_of_stock_option_id_index, out_of_stock_option_id){
          jQuery('#'+out_of_stock_option_id).addClass('out-of-stock');
        });
      }

    },

    addStatusToSwatch:function(options){

      //To find the selected attribute
      let selected_attribute_id = null;
      let selected_option_id = null;
      var selected_options = {};
      jQuery('div.swatch-attribute').each(function(k,v){
          selected_option_id = jQuery(v).attr('option-selected');
          if(selected_option_id){
            selected_attribute_id  = jQuery(v).attr('attribute-id');
            selected_options[selected_attribute_id] = selected_option_id;
          }
      });

      //To add stock status for the attribute not chosen
      jQuery('div.swatch-option').each(function(k,v){
          var swatch_id    = jQuery(v).attr('id').split('-');
          var attribute_id    = swatch_id[3];
          var option_id    = swatch_id[5];
          if(selected_attribute_id !== attribute_id && selected_option_id !== option_id ){

            selected_options[attribute_id] = option_id;
            var product_id_index = jQuery('[data-role=swatch-options]').data('mageSwatchRenderer').options.jsonConfig.index;

            jQuery.each(product_id_index, function(product_id,attributes){

                var productIsSelected = function(attributes, selected_options){
                    return _.isEqual(attributes, selected_options);
                }
                if(productIsSelected(attributes, selected_options) && options[product_id] && options[product_id].is_in_stock == 0){
                  jQuery(v).addClass('out-of-stock');
                }
            });
          }
      });
    },
    getProductIdSelected:function(){
        var selected_options = {};
        jQuery('div.swatch-attribute').each(function(k,v){
            var attribute_id    = jQuery(v).attr('attribute-id');
            var option_selected = jQuery(v).attr('option-selected');
            if(!attribute_id || !option_selected){ return;}
            selected_options[attribute_id] = option_selected;
        });

        //Find the product id of the selected option
        var product_id_index = jQuery('[data-role=swatch-options]').data('mageSwatchRenderer').options.jsonConfig.index;
        var found_ids = [];
        jQuery.each(product_id_index, function(product_id,attributes){
            var productIsSelected = function(attributes, selected_options){
                return _.isEqual(attributes, selected_options);
            }
            if(productIsSelected(attributes, selected_options)){
                found_ids.push(product_id);
            }
        });
        return found_ids;
    },
    _toggleShow: function (inStock) {
        if (inStock) {
            $('.box-tocart').removeClass('no-display');
            $('.box-out-of-stock').addClass('no-display');
        } else if(!inStock) {
            $('.box-tocart').addClass('no-display');
            $('.box-out-of-stock').removeClass('no-display');
        }
    }

});
return $.product.status;

});

Hello,

username is root

Hi.How are you ?
Please, do you have any news or update ?

Yes , i've modified the file to add another jquery ui dependency and enabled all the cache. It seems to have fixed it. 

Here is the modification.

"

    //    'jquery/ui',
    'jquery-ui-modules/tooltip',
    'jquery-ui-modules/widget',"

I would like now to disable the ajax swatches , and have the swatches linking directly to the selected color on the product page.

Can you please show a way to revert to the non ajax magento swatches if necessary ?

Thanks

Hello. 

It seems like the bug i've mentionned before is back.  

The swatches on the category page and the product page are misbehaving.

Once all the caches are enabled, the color swatches are misbehaving and are loading the wrong color and the wrong image.

I did switch to luma and the swatches were loading correctly

Switched to claue : same bug.

Switched to YouYou ( a children theme of Claue ) : same bug.

Please find a video describing the issue below .

https://www.youtube.com/watch?v=GIM0ZagcUEg

Could please help us fix it ?  or show us the way to load the swatches the way luma does ?

I am avail
Thanks .

yes. Once all the caches are enabled the issue shown in this video appears. 

Once the collections, eav and config caches are disabled the color swatches go back to their normal behavior. 

It also doesn't happen with luma. 

Thanks. Can you tell me which files you've modified ?
I need the information for moving the code to production.

Regards