Steps to reproduce the issue

Create a menu item of type "Compact list of tagged items" with a title "XXX" selecting one or more tags. Go to "Page Display" tab:

• leave empty both "Browser Page title" and "Page Heading".
• set "Show Page Heading" to Yes

In "Tag Options" set "Show tag name" to NO if you selected a single tag in the menu item details tab.

Expected result

Browser page and page heading should be "XXX"

Actual result

Browser page and page heading are the concatenation of tags titles.

System information (as much as possible)

Joomla 3.9.12

Additional comments