Steps to reproduce the issue

Go to a tagged items list, for example Joomla V4 in the sample data. Example:
localhost/j4xdemos/en/component/tags/tag/joomla-v4.html
Add ?types= to the url. Example:
localhost/j4xdemos/en/component/tags/tag/joomla-v4.html?types=

Expected result

Same as with ?types=1

Actual result

Page not found

System information (as much as possible)

SEO set up and using .htaccess.

Additional comments

The source of the problem seems to be line 202 of components/com_tags/src/Model/TagModel.php:

This came up in the Forum and I am not sure whether it should be treated as a bug. See:

https://forum.joomla.org/viewtopic.php?p=3695055&sid=2c5a716ed5c78fe21b0babb08605c78d#p3695055