This thread is resolved. Here is a description of the problem and solution.
Variable products disappear from the cart after that they are being added.
This problem was solved with WooCommerce Multilingual version 4.3.2 Please update to the latest version and see if it helps in your case. If not then please open a new ticket with your issue.
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This topic is split from https://wpml.org/forums/topic/wc-attributes-custom-fields-doesnt-show-in-translated-language/