GCode spam on perimeter overhangs caused by M106 enable fan commands

[ArsicN]

Description of the bug

When slicing any model that has curving overhang perimeters(from what I noticed, may apply to others), the slicer outputs multiples of M106 enable fan commands before and after each of the G1 commands. Using both 'Bridges fan speed' and 'Dynamic overhang fan' makes the issue twice as bad, but it is still there regardless of which of the either two is enabled/disabled.

Here is an example with a simple squished benchy(simply to force the overhang perimeter generation) that clearly shows the problem:

If I disable 'Bridges fan speed' by setting it to 0, it gets slightly less insane, however still very bloated:

The side effect of this was some stuttering of the printer when it reaches the overhangs, which was inexplicable to me at first. Another problem is that Arc Fitting does not recognize the overhang perimeters because of the M106 spam instead of neat G1 blocks of gcode.
I've tried the same thing in PS 2.6.1 and everything seems to work correctly, with G1 commands staying in blocks, with M106 only before and after the whole block, as expected. Here's the 2.6.1 example with the same benchy:

Project file & How to reproduce

M106 spam benchy.zip

• Slice the squished benchy and go to a layer where the bow has overhang perimeters.

• Move the horizontal gcode slider so the toolhead is in the middle of the overhang perimeter

• The issue should be apparent on the left side of the gcode line preview.

Checklist of files included above

• Project file
• Screenshot

Version of PrusaSlicer

2.7.0+win64

Operating system

Windows 10 22H2

Printer model

Ender 3 V2 Neo (with mods)

[bobjackman]

related: #11981

[Felix14-v2]

Can confirm in 2.8.0; this problem makes my fan literally uncontrollable

[ArsicN]

Yeah, unfortunately it still isn't fixed. I've been tracking other posts of the same issue but different circumstance and there doesn't seem to be much happening on fixing it.
I've moved to Klipper since posting this so I can mostly ignore the issue unlike Marlin which kept freezing while processing a ton of commands. Are you using klipper? @Felix14-v2

[Felix14-v2]

Are you using klipper? @Felix14-v2

Yes

[lukasmatena]

Fixed in 2.8.1-rc1. Closing.