Filament Tab's Bed Temperature Setting of 0 in Other Layers does not work as advertised.

Version

; generated by PrusaSlicer 2.2.0+win64 on 2020-08-28 at 06:19:36 UTC

Operating system type + version

Windows 10 v2004

3D printer brand / version + firmware version (if known)

Generic / Reprap Type

Behavior

GCODE generation doesn't obey Filament tab's temperature tool-tip stating that "0 will disable temperature control".

GCODE generated includes "M140 S0 ; set bed temperature" prior to printing layer 1

(1) Set both Bed temperature for First Layer and Other Layers to zero (0) (2) Generate GCODE for .stl (3) Open .gcode in Notepad or other text editor and search for "M140"

Goal Faster print startup times by allowing the bed and hot-end to preheat at the same time instead of waiting for the bed to preheat prior to starting the hot-end preheat time. The goal is to use M140 instead of M190 to preheat the bed, allow the printer to go through the home position routine during the preheat and wait until after the hot end is at temp before issuing the M190 command for bed temp. Slic3r Bed Temp Other Layers Issue.zip
Expected Results The GCODE would not turn off the bed temperature allowing layer specific temp using printer settings for printer tab's custom GCODE:

;BEFORE Layer Change Custom G-Code - Start ;[layer_num] {if layer_num == 0} ;CUSTOM G-CODE: Set bed temperature and wait for it to be reached before layer 1 M190 S75 {endif} {if layer_num == 7} ;CUSTOM G-CODE: Reduce Bed Temp to 50 degrees at layer 7 M140 S50 {endif} ;BEFORE Layer Change Custom G-Code - E n d



* _Actual Results_
The GCODE as noted above

_Is this a new feature request?_ 
No.

#### Project File (.3MF) where problem occurs
ZIP File Contents:
2020-04-28-001.3mf     => Project File
2020-08-28-001.png     => Image of Filament Tab settings showing tool-tip for Other Layers
2020-08-28-002.png     => Custom .GCODE logic before la
2020-08-28-001.gcode => Truncated .GCODE file showing generated bed temp issue:

prusa3d / PrusaSlicer