Nicolas

Sure thing, but I do not seem to find where the community support is, could you maybe give me a link?

This is quite weird, looking at the file it seems to be exacly the same as I sent you, no lines added, the same.

Hello,
Here is the file as asked. Please tell me if you need any additional file

Hello,

I've relaunched the game and it happened after a short "Alt + Tab" (maybe 5 minutes) and it appeared again but at another position (I've added a new screenshot).
The condition I can list before happening are :

• I switched windows with "Alt + Tab"

• I didn't open the pause menu before switching windows (it opened automatically when i got back on the games)

• I stayed out of the game screen for at least 5 minutes ( maybe more )

• I'm playing on Fullscreen

• The "stain" is fixed to the HUD (it dissapear in "F1 mode")

PS : I'll try doing it 2 to 3 more times to check if my theory is correct ( I'll add a screenshot each time I manage to do it)

Edit : I didn't manage to redo it i'll try after a "long time" (approximatively 10 hours)

Edit 2 : (28/03/2023 18:28) I taken the screenshot with the F3 debug mode + the "stain" appeared lightly this time

Edit 3 : (30/03/2023 12:08) I uploaded 2 screenshots 1 with the F3 debug mode and 1 without because the "stain" appeared top right this time.

Edit 4 : (30/03/2023 13:31) On my last screenshot I have 4 "stain" on the screen (it is the same session than "Edit 3")

Still a bug in 1.17.1, and it also affects turtles

Why can people just put attachments on my own reports? Like they can put cp on it. And amievd Optifine is not developed by Mojang, refer to its devolpers.

also why dont you use the physical keyboard?

dude thats your problem use the on screen keyboard integrated with windows

As an update: we played again and we noticed other anomalies, such as mobs spawning in large groups (9 creepers, no other enemies) in well-lit areas, more mobs spawning inside walls (even into 1-block-wide walls inside our house, with plenty of room on both sides, and while it was surrounded by torches)

In the nether we encountered several mobs spawning inside walls, ghasts in particular, but also one blaze which spawned randomly without any fortress and died in a wall.

In the end we reverted back to 1.16.2 and it seems like those spawn-related bugs disappeared.

Moreover, we noticed that tamed cats stand still and do not follow the player, and instead teleport next to it as it gets very far away (this is present both in .12 and .13)

No, completely vanilla

Server is hosted on Windows 10, if it helps

All the new generated chest are affected

Same here, i didnt find the chest but at least there was the TNT

Paintings aren't there

The water doesn't move and the fire

@violine1101
yes, it's still there

The description is changed.

(Translated with Google Translate.)