I can confirm that what you did works easily in Part Design
But, by doing this you have have mixed Part Design and Part workbench. Not recommended if you don't understand what you've done.
as always I am confusedchrisb wrote:...it is easier to understand that applying a Part Cut (or other boolean) to the whole body is allowed, than to understand the PartDesign booleans.
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OS: Windows 10 Version 1909 Word size of FreeCAD: 64-bit Version: 0.20.24787 (Git) Build type: Release Branch: master Hash: ea96f1860164ff8a6751b21b3fb4d425fc87f5e5 Python version: 3.8.6+ Qt version: 5.15.2 Coin version: 4.0.1 OCC version: 7.5.0 Locale: English/United Kingdom (en_GB)