Brim height not respecting first layer height when expressed as percentage

[Wil-Storch]

Version

SuperSlicer v2.2.5.1

Operating system type + version

Win 10 LTSB v1607

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

Creality Ender 3 profile 0.4mm nozzle, Klipper firmware (using Marlin as g-code flavour)

Behavior

• Describe the problem
  When using an initial layer height expressed as a percentage (in this case 75%) the Brim layer height is too large. A 0.4mm nozzle results in a 0.42mm high brim height, rather than 0.3mm as expected.
  The 0.3mm value is respected for other line types - skirt and support in this case.

• Steps needed to reproduce the problem
  Set initial layer height as a percentage
  Enable brim

Expected behaviour: 0.3mm brim height

Actual behaviour: 0.42mm brim height

Is this a new feature request?
No

Project File (.3MF) where problem occurs

Can toggle between 0.3mm and 75% initial layer in attached file
Percentage1stLayer_Bugreport.zip

[supermerill]

seems to be a visualisation issue, the gcode extrude the whole first layer at 0.3mm height in the gcode.