Not sure where to post a possible issue in KiCad V6.
I imported a pcb from Altium CircuitStudio (latest) and the mounting holes I had created in CircuitStudio did not import properly into KiCad. What I got was a pad the ccorrect shape but a very small hole in the centre.
I think I worked out what happened.
In CircuitStudio you cannot create non-plated, pad-less, copperless holes (say Pcb mounting holes).
What you have to do is create a pad with a hole bigger than the pad size specified, and uncheck the ‘plated’ option…so you end up with a simple hole in the FR4.
As far as I can see though, KiCad doesn’t support holes bigger than pads, so when I import this Pcb Kicad reduces the hole size down to a bare minimum.
What I then have to do is deleted the hole/pad and create a KiCad one.
On Altium Designer this isn’t an issue, I believe, because it has more configuration options for pads and so you don’t have to ‘cheat’ like you do in CircuitStudio.
Maybe there’s another way in CircuitStudio, but I never found it.