Description of the bug

Prusaslicer inserts unexpected and unremovable SET_PRESSURE_ADVANCE ADVANCE=0 comands
when unloading filament for toolchange and never restores it.

Klipper saves pressure advance change for the current extruder and never restores the original advance.

Project file & How to reproduce

Base.zip
Set gcode flavor to Klipper
Add more than 1 extruder, slice something with multiple colours.

Reproducible even if retraction length on toolchange is set to 0.

Recommended change: remove the command. Klipper tool changes are generally gcode scripts and expecting any tuning like this to happen there, with slicer focusing on actual slicing.

Relevant Gcode snippet:

; CP TOOLCHANGE UNLOAD
;WIDTH:0.5
SET_PRESSURE_ADVANCE ADVANCE=0
;WIDTH:0.5
G4 S0
G1 E-5 F2400
;WIPE_START
G1 F14400
G1 X201.281 Y179.446 E-.16653
;WIPE_END
G1 E-4.83347 F2400
G1 Z4.1 F18000
M104 S245 T0 ; set temperature ;cooldown
M104 S250 T1 ; set new tool temperature so it can start heating while changing
T1
M109 S250 T1 ; set temperature and wait for it to be reached

Checklist of files included above

• Project file
• Screenshot

Version of PrusaSlicer

2.6.0

Operating system

Win11

Printer model

Voron 2.4