[Bug]: Expiration date set for link share despite of unchecked checkbox

[ElSi-DVT]

⚠️ 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

In #49115 the issue about a missing hint for the expiration date for link shares were fixed.
That's great so far.

There is also a new option "Enable link expiration", but the problem is if you uncheck this checkbox, the value will not be considered and if you look in the settings of this link share you can see that an expiration date was set.

Steps to reproduce

1. Configure the following sharing settings:

• Allow users to share via link and emails
• Always ask for a password
• Enforce password protection
• Set default expiration date for share via link or email
• Enforce expiration date for remote shares

2. Create a link share and uncheck "Enable link expiration".
3. Click on "Customise link" and see that an expiration date was set.

Expected behavior

If you have a look at the link settings the option "Set expiration date" should be unchecked like when creating the share.

Nextcloud Server version

30.0.6

[nfebe]

#50694