Graphic corruption in pause menu of Jazz Jackrabbit

[Vort]

When Jazz Jackrabbit game is paused by pressing Esc, window background is sometimes rendered incorrectly:

This is how menu opening looks in DosBox:

dosbox_jazz_ui.mp4

To reproduce this problem, character should be close to this location:

Pixel perfect location is not required, but I tried to reproduce it anyway:

bochs_jazz_ui.mp4

I'm not sure if this is bug in Bochs, in game or I'm doing something wrong, hard to say without further investigation.

Test files: Jazz2.zip

Version: 110bb94.