Concat protocol broken

[Hunny Puppy]

Summary of the bug: This is a bug with the latest build(N-80335-gcb46b78), it was working fine from a old build that I have (N-77010-g4e31176). With the new build yesterday I'm getting this error.
How to reproduce:

ffmpeg.exe -hide_banner -probesize 100M -analyzeduration 300M -fflags +genpts -y -f concat -i "C:\temp\working1\WMV_ConcatList.txt" -map v -vcodec copy -map a -acodec copy -avoid_negative_ts 1 "C:\temp\working1\WMV_0_0.avi"
[concat @ 000000e8fb210b00] Unsafe file name 'C:\temp\working1\WMV_24_852.avi'
C:\temp\working1\WMV_ConcatList.txt: Operation not permitted

I checked the documentation and while I know the safe option exists, based on the rules specified this filename should be legal but ffmpeg doesn't seem to think so. It may be a bug or a regression not sure how to classify it but I don't think it should break.

[Cigaes]

This has nothing to do with the concat protocol, please pay attention. As for the concat demuxer, the path is not relative and contains one forbidden character, that makes two reasons it is not considered safe.

[Hunny Puppy]

Sorry, I think I misread the documentation. Although it's not clear why having an absolute path would be considered "unsafe"