Overlapping Reservation Conflict Not Detected When Editing Existing Reservation With Resource Of Meeting Rooms

Steps to reproduce

1.Reserve room 301 from 2 PM to 4 PM for today.
2.Another user reserves the same room for a different time slot, such as 1 PM to 2 PM.
3.The calendar system successfully creates both reservations without any errors.
4.Second user then decides to edit his reservation to overlap with the first reservation, changing it from 1 PM to 2 PM to 2 PM to 4 PM.
5.The calendar system allows the edit without any warning or error message, even though there is now a conflict between the two reservations (both occupying room 301 from 2 PM to 4 PM).

Expected behavior

The calendar system should prevent the editing of a reservation if it would result in an overlapping conflict with another existing reservation. An appropriate error message should be displayed to inform the user of the conflict before allowing the edit.

Actual behaviour

Currently, the calendar system does not provide any feedback or prevention mechanism for overlapping reservations during edits.

Calendar app version

latest

CalDAV-clients used

No response

Browser

No response

Client operating system

No response

Server operating system

No response

Web server

None

Database engine version

None

PHP engine version

None

Nextcloud version

No response

Updated from an older installed version or fresh install

None

List of activated apps

No response

Nextcloud configuration

No response

Web server error log

No response

Log file

No response

Browser log

No response

Additional info

No response

No files or tests are identified in the issue. Start by reproducing the reservation edit flow described above and trace where overlapping resource reservations are checked; done means an edit that creates an overlap is rejected with a user-visible conflict message and existing non-overlapping edits still work.