Steps to reproduce

Case 1

1. Add <translate> tags to a template-namespace.
2. Click on the Mark this page for translation link on the top of the page.

Case 2

1. Have a page marked for translation with title translation disabled.
2. Make some changes to it, so that the Mark this page for translation link appears.
3. Click on the link.

Actual result

Allow translation of page title is checked. In case 2, this means that submitting the form without any changes re-enables title translation again and again.

Expected result

Allow translation of page title is unchecked. (Case 1 was introduced in T305240: Make "Allow translation of page title" switched off by default for pages in Template: namespace, while case 2 is common sense – if title translation has been disabled, it probably has a reason.)

Software version

Based on the timing, probably a regression from T401874: Disable the "Allow translation of page title" option in Extension:Translate on wishlist entity pages (yes, it took three months for me to open this task, sorry…).