This bug doesn't only happen at chunk borders.
@Justerfrog I think that's just a resource pack...
Was your inventory full at the time?
Do you have cheats on or already have the achievement/ got it on a different device?
The problem may be your monitor. If possible, upload a screenshot.
Not a bug. Change your UI profile. In Minecraft, click "Settings" > Click "Video" > Scroll to "UI Profile" > Change it to "Classic"
This is a duplicate of MCPE-55092
Uploaded a video of the bug in action.
Can confirm, uploaded a screenshot of this bug.
try turning off auto-lock in ios settings
Settings app>Display & Brightness>Auto-Lock
How do you perform this glitch/ what were you doing when the glitch occurred
do you have a backup of the world from before?
Runear: I can confirm.
Me too, I noticed that the Super Mario Mash-up Pack was missing.
Can confirm this for Minecraft 1.16.220, unfortunately. I could only recreate the issue with not being able to sprint. For the first issue about the half inputs, I recommend you set your in-game sensitivity to 100.