I was involved selling Mazdas, some with the rotary (Wankel) engines many years ago.
Stunning engines to drive behind but questionable reliability.
The problem was often incorrect proceedures when servicing.
IIRC the quickest way to wreck one was to to turn it backwards. This was often done when setting the points. (Remember them!) The rotor tip seals chattered and broke.
I wonder if this this problem has been cured for the Wilksh engines. Just thinking of the to and fro motion of the prop when the engine stops, never mind mishandling.
D.O.