The F3 screen doesn't show some information (like coordinate, block state. etc.) and the Debug Pie sometimes remains on the screen even after closing the F3 screen.
MC-171893
Broken F3 screen
Resolved
Duplicate
0
Emanuele De Paoli
(Unassigned)
Unconfirmed
(Unassigned)
1.15.2
Retrieved
Pie chart issue duplicates MC-170816. As for the missing information, you either have
reducedDebugInfogamerule set to true, or Reduced Debug Info option set to on