Tasks: Pagination broken

Pagination stopped working in Task perspective under the default tabs: Active, All and Admin.
When the number of rows exceeds the set number of rows per page, the list doesn't allow moving to the next page and the total number of rows is counted incorrectly.
The problem can be solved by increasing the number or rows per page, but if that number exceeds 20 (which is the max value for the number of rows per page), the user can't access the rest of the tasks unless searching for a workaround via custom filters and use of sorting.

Furthermore, the Admin tab shows completely bogus number of rows and it shows tasks even to the users who don't have proper roles to see them in this tab.
The user who can see the tasks in the Admin tab used in the recording has only the following roles set: admin,testgroup,rest-all,kie-server, but has access to Admin tab regardless. I didn't want to open a separate issue for this as at this point it may stem from the pagination issue.