If you change the snapRange 'on-the-fly' (see Draft_Snap) the value can become negative if you use the decrease key: "]".
A negative value seems to work fine for Draft_Snap_Grid, but in the task panel of the Draft_SelectPlane command a negative value is displayed as zero.
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OS: Windows 8.1 (6.3)
Word size of FreeCAD: 64-bit
Version: 0.20.25220 (Git)
Build type: Release
Branch: master
Hash: 46282db7c8c65d1205a4cd03499d4beadb1573c6
Python version: 3.8.10
Qt version: 5.12.9
Coin version: 4.0.0
OCC version: 7.5.2
Locale: Dutch/Netherlands (nl_NL)