[Bug]: After update 33.0.2 → 33.0.3, occ upgrade does not populate new MIME types — files download instead of opening in viewer

Steps to reproduce

1. Update Nextcloud from 33.0.2 to 33.0.3 via occ upgrade
2. Open any Office file (.docx, .xlsx, .pptx, .odt, etc.) in the Files app

Expected behavior

File opens in Nextcloud Office (richdocuments/Collabora)

Actual behavior

Browser immediately triggers a download dialog. Files are downloaded instead of opened.

Fix

Manually running the following commands resolves the issue:
php occ maintenance:mimetype:update-db
php occ maintenance:mimetype:update-js

Output: "Added 88 new mimetypes" — all missing after the 33.0.2 → 33.0.3 update.

Environment

Nextcloud: 33.0.2 → 33.0.3
richdocuments (Collabora): 10.1.3
viewer: 6.0.0
PHP OPcache: enabled (Apache)
DB: MySQL
Root cause
occ upgrade does not call maintenance:mimetype:update-db during the
33.0.2 → 33.0.3 patch migration. New MIME types added to mimetypemapping.json
in 33.0.3 are never written to the oc_mimetypes table, so Nextcloud cannot
route file opens to the correct viewer app — it falls back to a browser download.

Start by tracing the occ upgrade path for the 33.0.2 to 33.0.3 migration, then compare it with maintenance:mimetype:update-db and the entries in mimetypemapping.json. Check the oc_mimetypes table before and after the upgrade. Done means the new MIME types are populated automatically and Office files open in the viewer instead of downloading.