Good news, the latest release candidate has working zoom. The update is only available from the test channel but a stable release is right around the corner. If you can’t wait, you can connect to this channel via Android’s Developer options (see screenshot). But be aware that these updates are not fully tested, so one might run into issues.
Here’s a direct-download in case someone wants that for flashing:
e-3.1-rc-a15-20250728513097-official-FP6.zip
EDIT:
Just tried Gcam, zoom works here too.
EDIT2:
New Release Candidate is available:
e-3.1-rc.2-a15-20250730513869-official-FP6.zip