I saw crashes with my Oregon 600 close to roundabouts some years ago, but with maps that were created with a different style.
No such problems in the last three years or so.
Did you contact Thorsten Kukuk?
Maybe upload the offending tile (not the whole map, please) to https://files.mkgmap.org.uk/ so that I can run some analyses tools on it.
I do occasionally find such crashes on my Oregon. If it happens, the crash is reproducible at the specific place.
After an update of a map on the device - not necessarily a map covering that specific place! - the crash vanishes. Maybe, a new crash could then be found some where else - but you’ll likely not find that new place.