[Resolved] We have encountered an issue with WPML when using Classic Editor

Background of the issue:
Issue Description:
When editing a post in Gutenberg, the tag search works correctly.
In Classic Editor, when entering a tag name, the AJAX request (ajax-tag-search) does not return some tags in Ukrainian.
For example, the tags "Ізраїль" and "Дональд Трамп" exist in the database and have correct translations, but they do not appear in the list of found tags in Classic Editor.

Other Ukrainian tags (e.g., “Меланія Трамп”) for the search term “Трамп” are found in the same interface without problems.
🔹 What We Have Already Checked:
✅ The tags exist in the database (wp_terms) and have correct relationships in wp_icl_translations.
✅ The tags appear as translated in WPML → Taxonomy Translation.
✅ Logging is enabled, and the SQL query shows that WPML filters out the missing tags in Classic Editor.
✅ Clearing WPML cache and regenerating taxonomies did not resolve the issue.
✅ Disabling all plugins except WPML and Classic Editor did not solve the problem.
✅ When disabling Classic Editor and switching to Gutenberg, everything works correctly, and all tags are displayed.
✅ Manually filtering ajax-tag-search (e.g., via wp_ajax_ajax-tag-search) did not resolve the issue.

🔹 What We Suspect:
WPML may be incorrectly determining the language in Classic Editor, causing it to filter tags based on the wrong language_code.
Classic Editor uses an older tag search mechanism (tagsdiv-post_tag), and WPML filters may not be applying properly.
The AJAX request in Classic Editor may not be passing the correct language, leading WPML to exclude certain tags.
🔹 Questions:
Are there any known fixes or recommendations for improving WPML compatibility with Classic Editor?
How can we manually intercept and correct WPML’s tag filtering in Classic Editor?
Is there an official patch planned for Classic Editor support in future WPML updates?
Thank you for your time and assistance! We look forward to your response.

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