a small glitch in layering

[crypt47]

Preliminary checks

• I've checked that there aren't other open issues on the same topic.
• I've checked that this issue is reproducible on the latest snapshot build.

Platform

Linux

Describe the bug

Please, see the screenshot, one of the horse's heads. The version is 1.1.3.

Save file

Seven_Lakes_0021.sav.zip

Additional info

No response

[oleg-derevenetz]

Probably related to #5716.

[Branikolog]

Hello!
I've recently met this issue too. The issue is valid only for the original maps. fh2 maps are rendered correctly regarding this object.
By the way, the original game also has this flaw, so I expect this as problem with the object itself.