Sometimes, the your hotbar starts to flicker until you open the menu.
There is a way to consistently reproduce the bug, which I show in this video:
Step by step reproduction guide:
- Go to Pixelstation
- Go below the regular daily bonus area
- Open your hotbar
- Jump and hit a daily bonus gift box above you mid-air
- Fall down with the gift box UI closing on it’s own
- Repeat step 5 & 6 once
- Done! Enjoy yourself an unusable hotbar! (Once you get tired of it, simply open the menu and close it again)
I hope this helps fix the bug, which admittedly is a very minor one.