Unnecessary internal solid infill layers

[fpikus]

Version
Slic3r++ 1.42.0-a6

Operating system type + version
Windows 10 64-bit

3D printer brand / version + firmware version (if known)
Prusa Mk2.5 (not relevant, this is slicing issue)

Behavior
Slicing the attached model. Prusa version of Slic3r generates solid infill around the tops and bottoms of the holes in small circles (at heights around 5.6mm). Slic3r++ generates several layers of solid infill, using top infill pattern for one of them - an octogram spiral layer buried in the middle of the print (see attached screenshots).
I tried disabling anchor size or using the default anchor size, no difference.

Slic3r++:

Prusa:

Tool stand.3mf.txt

Project File (.3MF) (or stl+config) where problem occurs

file-> save as

zip it

drag it here

[supermerill]

Seems to be the "extra perimeters" that go full-steam on the number of perimeter: It adds a perimeter to the part/layer as long as it detects an overhang. I have to make it a bit less perimeter-happy (to only draw them on overhang areas). Will come soon©.

Also, it should have detected that ther is bridge, not overhangs, i will check it, seems like a bug.

You can uncheck the option for now.