Whenever you apply specific resource packs with UI, an annoying red or yellow triangle will appear on the HUD screen. Additionally, whenever you open your inventory and then move your cursor, the triangle will shift to where your cursor was positioned before you closed inventory,
This issue was present in the beta, was fixed in a later beta, but somehow made its way into the full release. The bug appears to be referencing the item lock textures for the inventory introduced in this update.
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Could you please attach the texture packs you're using to this ticket?

The issue is that many UI texture packs now are throwing tons of log errors due to the update, so I feared that it would automatically invalidate the bug report. But believe me, this issue is widespread and has been documented by many people i've spoken with. This is just the one that I used in my screenshots: http://www.mediafire.com/file/aa6st9zn4iq1efy/VDX_-_Java_UI_v1.10.mcpack/file

I attached a resource pack that makes the textures for these item lock icons invisible as a temporary solution.

This bug just happened too on Windows 10 today. Yesterday everything seemed to work just fine.

I use FoxyNoTail's resource pack (v3.1.0), and have the red arrow too. SilentWisperer has pointed this out many times in the beta bug review, and it still happens. It is really silly.

Facing the same issue on windows 10 using my redstone texture pack. If I disable both global and map specific texture packs the arrow is gone.

I'm also experiencing the same problem. I have a port of Technoblade's texture pack, and 9 other overlay texture packs including FoxyNoTail ones. I was playing today, when I realized there was a new update! So I went to the Microsoft Store to download it, and when I returned, that distracting little arrow was there! I thought it was one of my texture packs auto updating, but I checked, and it happened for all of them.

If this was fixed in a later beta does that refer to the 1.16.200 betas?
Thank you for your report!
However, this issue has been closed as Invalid.
For feedback or issues with third party content, please contact the content creators directly.
The issue here appears to be that screens have been copied entirely. The resource pack is overriding "hud_screen.json" with the 1.16 version of the same file so it was causing this issue.
Specifically this line (without the spaces beside the @) should be removed from the custom resource pack "hud_screen.json" file to remove the red triangle, but due to differences with the current version of the file there might be other problems happening:
{ "inventory_selected_icon_button @ common.inventory_selected_icon_button": {} }
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@Mega_Spud, this fixed it. Thank you!

https://mcpedl.com/dragon-zahf22-addon/
The bug still exists for this pack.
I expect for there not to be a red cursor 24/7 but there is one.

Please contact the addon creator directly to fix it
You may also fix it yourself using an app such as notepad++

Do you know where it would appear?

how its that solved if i have this on mc 1.19 but whit a golden square that is pointing anywhere is my cursor, i checked every texture and i tried to edit but is still show . i hope you understand what i want to say , sorry for my bad english