Green line glitches on HyperPixel 4.0 Square with Pi 3 A+

There are green glitch lines appearing on the screen. What could be the cause of this?

Glitches appeared after rebooting with display_rotate=2 in /boot/config.txt , setting it back to display_rotate=1 didn’t help.

I tried mounting the screen on a Pi 4 B and the glitches persisted.