Cursor in the wrong place in fullscreen landscape (iOS) #159

I'm on iOS 26.6, iPhone 15 Pro. Conduit version 1.4.11.

In landscape orientation in fullscreen, the highlighted cursor position is consistently offset to the right by 7 or 8 characters.

Default font size, both nerd font and the system one.
I thought it might be due to control characters in my $PS1, but setting a plain $PS1 didn't help.