I can confirm that it also happens in vanilla Minecraft (1.16.4) and without any resource packs.
To reproduce it, I put myself in spectator mode and clicked on a creeper. After pressing a number key to show the spectator mode hotbar, the same white box appears.
Max Henkel
MC-97516
![[Mod] violine1101](../../../data/avatars/users/92858.png){kind=small}
I can confirm that it also happens in vanilla Minecraft (1.16.4) and without any resource packs.
To reproduce it, I put myself in spectator mode and clicked on a creeper. After pressing a number key to show the spectator mode hotbar, the same white box appears.
Can confirm in 1.18. The debug screen even without the graph halves my FPS.
This is still a thing in 1.18.2