🇦🇷Argentina @tongadall

I confirm the bug too:

Drupal 9.5.5
Date Popup 8.x-1.3
Tokens in Views Filter Criteria 8.x-1.5

I guess that the problem is that both modules are using the hook_views_plugins_filter_alter to register own plugin class.

In yout patch #3 the second $element['min']['#attributes']['type'] = 'date'; should be ['max'] I guess.