[PHPBB3-16296] Unable to delete or mark PMs in UCP folder view

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Type: Bug
Status: Closed (View Workflow)
Priority: Blocker
Resolution: Fixed
Affects Version/s: 3.2.9, 3.3.0
Fix Version/s: 3.2.10-RC1, 3.3.1-RC1
Component/s: Private Messages (PM)
Labels:
- Delete
- PM
- UCP
Environment:
PHP 7.2.19
MySQL(i) 10.2.19-MariaDB
Chrome 79.0.3945.88 (64-bit)
Firefox 71.0 (64-bit)

Hi,

This happens in the official forums:

And tested 3.2.9 & 3.3.0 versions on "clean" forums test.

Go to Private Messages - Inbox - Mark some PM to delete, select "Delete Marked"

Click "Go" and I see this message:

The submitted form was invalid. Try submitting again.

is duplicated by

PHPBB3-16304 Invalid form error on deleting PM inbox items

PHPBB3-16375 bug on PM message update