I have two cases with hole based on sketch:
1. If you make a sketch with slot or rectangle with rounded edges.
2. If you make a sketch with arc and then if you try to make a hole using this sketch the model will disappear
According to wiki "The Hole feature creates one or more holes from a selected sketch's circles"
OS: Windows 10 Version 2009
Word size of FreeCAD: 64-bit
Version: 0.20.24787 (Git)
Build type: Release
Python version: 3.8.6+
Qt version: 5.15.2
Coin version: 4.0.1
OCC version: 7.5.0