[Bug]: Video verification for mail shares buggy

⚠️ This issue respects the following points: ⚠️

• This is a bug, not a question or a configuration/webserver/proxy issue.
• This issue is not already reported on Github OR Nextcloud Community Forum (I've searched it).
• Nextcloud Server is up to date. See Maintenance and Release Schedule for supported versions.
• I agree to follow Nextcloud's Code of Conduct.

Bug description

I found 3 Bugs:

1. When creating an email share, it's not possible to tick the checkbox for the video verification.
2. When editing a share, the checkbox for the video verification only appears after removing the password share once.
3. There are errors saving the share even after ticking the checkbox.

Keep in mind that everything only happens for mail shares - normal links work fine.

Steps to reproduce

1. Create a test file.
2. Share it via email.
3. Create a password.
4. Try to activate video verification - should already not work (Bug 1)
5. Safe the share without the video verification
6. edit the share - the checkbox should be active but is not (Bug 2)
7. deactivate and activate the password again - the video verification checkbox is visible again
8. save the share - there should be an error with the password (shown message) (Bug 3)

Expected behavior

Mail shares should work exactly like link shares.

Nextcloud Server version

31

Operating system

None

PHP engine version

None

Web server

None

Database engine version

None

Is this bug present after an update or on a fresh install?

None

Are you using the Nextcloud Server Encryption module?

None

What user-backends are you using?

• Default user-backend (database)
• LDAP/ Active Directory
• SSO - SAML
• Other

Configuration report

List of activated Apps

Nextcloud Signing status

Nextcloud Logs

Additional info

Might be similar to #22408

Tested on company NC instance.

Reproduce the three failures using the listed steps, comparing email shares with normal link shares and observing the checkbox and save behavior. Trace the share-edit and save paths involved in video verification, then verify that creating, editing, and saving a password-protected mail share works like a link share without the reported errors.