I didn't have an issue with my 2018 but saw a lot of people breaking studs off.
They must have used cheaper material?
They just cross thread so easily. I believe it's due to improper lead in, possibly on
both the lugnut and stud. And the length of most of the factory studs mean you're gingerly using two fingers to start it
relatively deep in the wheel (alloys only).
No tire shop is going to take the time, and
then we return to the poor lead in when trying to just use a socket on a gun --
no feel. With extra fine threads, once you cross thread just ONE thread
even a little, it's all over but the cryin'. You stand a
better chance of recovery with coarse threads
But tire shops will force it home with the gun. When you go to remove it, M12 ain't
that strong and it snaps.
If they had given the studs a short bit of straight shank with no thread and countersunk the nuts a bit more I think problems would drop by 85%+. Indeed they'll teach you in school the primary purpose of a c-sink on nuts or threaded holes is to aid starting the threads ‐- it "funnels" them together. The Subaru nuts I've eyeballed have very little visible c-sink.
These are just theories. Honestly I've always wanted to try to modify both the nuts and (longer) studs to see if my thoughts hold true, but no time. I just use great caution when dealing with Subie lugs
