[Resolved] Split: WPML REWRITE BASE / 404 ISSUE (SERVER-LEVEL EFFECT)

Thank you! This resolved the issue.

I am sending you the message below for the Rewrite base issue / 404 server-level effect to open a new ticket.

WPML REWRITE BASE / 404 ISSUE (SERVER-LEVEL EFFECT)
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Problem:
- When WPML is enabled and a visitor switches language to /en/,
WordPress rewrites .htaccess with:
RewriteBase /en/
and routes requests to /en/index.php
- There is NO physical /en/ directory (language URLs are virtual).
- This causes REST API endpoints (/wp-json/, /wp-json/wp/v2/) to break
and results in intermittent server-level 404 errors.

Observations:
- Disabling WPML immediately stops this behaviour.
- Locking .htaccess (permissions 444) prevents the rewrite and stabilizes the site,
but this is only a workaround, not a proper fix. (For now, I kept it locked so the website can run)

We need:
- Confirmation whether this is a known WPML issue with
“Different languages in directories”
- Proper guidance on preventing RewriteBase from being rewritten to /en/
while keeping directory-based language URLs.