If the gamemode switcher menu is open, resizing the Minecraft window will cause the icons to stay in place and not be cleared off the screen as the window changes size. The menu will still work, but the glitch will persist as long as the menu is opened
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Thank you for your report!
However, we are already tracking this issue, and this report is a Duplicate of MC-183784, which is a report that has not been resolved yet.
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I can confirm this for 20w30a though I didn't get it as bad as you did.