Apex seals were fixes years ago.
Um.... yeeaaaaaaaa, according to Mazda’s marketing department.
Actual rotary engine owners, however, seem to have differing definitions of “fixed” from the manufacture(s). I’ve had more than one friend with a RX-7 who, after a seal tear-down and then an engine replacement, decided that however neat, cool and wicked fast the RX-7 with a Wankel was... it simply cost too much to keep running.
Mind you, I think that the Wankel concept is cool. The seals, however, give engineers fits in several ways - how their mating aspect angles change throughout the cycle, materials failures, spring pressure failures, blow-by, etc.
The failure rate of apex seals vs. the failure rate of rings in a piston engine pretty much tells the story that they’re still not in the same reliability/longevity ballpark as recip engines.