Cannot run update.php

Not clear to me what the issue is either, but the suggested fix of removing the offending twig files fixed it for me as well.

Here's a related core issue, though not clear that it's actually a core problem or how to recreate with only core: 🐛 array_diff(): Argument #2 must be of type array, null given in array_diff() (line 702 [...] core/lib/Drupal/Core/Theme/Registry.php) Postponed: needs info

I will open a MR with the suggested fix as a temporary workaround.

In my case, removing this file bootstrap/templates/block/block.html.twig
resolved the update.php issue.

In the end, it boils down to my custom theme hook implementation.
customTheme_preprocess_block__BlockID()
I removed that and update.php works.

Marking as fixed as this was released in the 8.x-3.32 → and fixed the issue for me - tested on the latest Drupal core 10.3.2.

Remove file generate error : Twig\Error\LoaderError: Template "themes/contrib/bootstrap/templates/block/block--system-menu-block--main.html.twig" is not defined.