I installed Freecad 26.3 today and had a little play with it. I drew the engine cylinder that caused odd happenings (including in ver 1.1.4). This is what I got.
The fillet around the base is 1mm and I am going to apply a 1mm fillet to the base boss.
Before the fillet…

And after the fillet.

And ver 1.1.4? Oops.

Freecad 26.3 has a few glitches, but it is a pre-release version, so no beef there. Still tinkering.
Lee