This thread is resolved. Here is a description of the problem and solution.
Problem:
You are trying to use default WooCommerce translations for your shop, but WPML can't load the default .mo file.
Solution:
1) Go to Dashboard > Updates and load the latest updates for WordPress.
2) Go to WPML > Theme & Plugin Localization and scan the theme and plugins for strings.
Before running these steps on the staging, ensure to fix collation issues and run WPML troubleshooting options to clean up string tables (WPML > Support > troubleshooting).
If these steps do not resolve the issue, it could be due to various factors such as minimum server requirements, server limitations like missing writing permissions, corrupted data on the string tables, corrupted language files, or issues between plugins or the theme.
If you encounter issues on the live site after applying these steps, we recommend opening a new support ticket. Additionally, we highly recommend checking related known issues at https://wpml.org/known-issues/, verifying the version of the permanent fix, and confirming that you have installed the latest versions of themes and plugins.
If the solution provided here is not relevant or outdated, please contact us for further assistance at WPML support forum.
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