I want to reverse the filament detection sensor contact

As a filament detection sensor, the proximity sensor was purchased as an NPN NO type and the filament detection was reversed.
Is there any way to use this sensor now by modifying the firmware?
If so, I'd appreciate it if you could tell me where to fix it.

The issue identifies the filament-detection firmware logic as the work area but names no file or test. Start by locating where the proximity sensor state is read and how its polarity is interpreted; done means an NPN NO sensor reports filament present and absent correctly.

Written by the indexing model from the issue text.