[Закрытые] Random LiteSpeed 404 Errors on English pages

Background of the issue:
I am trying to solve the problem of random 404 errors on my page after my server was changed to LiteSpeed. The issue appears on English pages, while the Finnish pages are mostly unaffected. I have tried resaving permalinks, checking the htaccess file, clearing the WPML cache, and uninstalling WP Rocket and LiteSpeed cache. I noticed WPML indicates that 'REST API is disabled, blocking some features of WPML'. Here is a link to a page where the issue can be seen: скрытая ссылка.

Symptoms:
Random 404 errors appear on English pages, showing a LiteSpeed 404 page instead of the site's normal 404 template. The home page is unaffected, and the issue is less frequent on Finnish pages. WPML reports 'REST API is disabled, blocking some features of WPML'.

Questions:
Could the 'REST API is disabled' message from WPML be contributing to the 404 errors?
I don't have access to server settings, but I have notified my hosting if they could see into it.