If you go to Options → Resource Packs, you will see that the High Contrast and Programmer Arts Resource Packs are listed as Made for an older version of Minecraft.
This is because the Resource Pack format has been updated to 42 in 1.21.2 Pre-Release 1, however, Mojang forgot to update the pack formats for the 2 resource packs to 42.
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We do not have enough information to find the cause of this issue.
Please record a video of this happening in which you also show the game's title screen as well and attach it to this report.
If you are on Windows, you can use Windows+Alt+R to open a built-in app for recording game footage.
If you are on Mac (Mojave or later), you can use Shift+Command+5 to open a built-in app for recording your screen.
In case you don't have a program to record videos, we recommend using the free recording software OBS.
In case the resulting video file is too large to be uploaded to the bug tracker directly, please upload it elsewhere (e.g. as unlisted video on YouTube) and link to it here.
This issue is being temporarily resolved as Awaiting Response. Once the requested information has been delivered, the report will be reopened automatically.
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I cannot reproduce this. Please attach a video of this occurring, in which you also show the game's title screen as well.