The slider bar appears broken.
How to reproduce:
Press P to open the social menu
If no slider appears try increasing GUI scale or add more players
Linked issues
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Comments 4
This was actually showed off in Xsumia's video as well: https://www.youtube.com/watch?v=BDQlrXLC-4A
Are you using any resource packs? Also, please provide a screenshot of this occurring with the F3 debug screen enabled.