There was a batch of bad chains, and these were replaced under warantee (by a dodgy method). I have a copy of the dealer recall notification dated May 1994. From memory the dealers marked the rocker cover with a blue dot of paint when this had been done. The letter says it was bad case hardening in the timing chain rivets for chassis numbers P1131527-P1222241, and engine numbers 01031600-01033000, so around 1400 engines.
I had a chain snap on the LC which was not part of the bad batch of chains, and that got expensive. It appears the failure mode is that the chain goes slack enough for it to climb up on one of the prongs of the cam sprocket, and as the snagged link goes over the top, the chain either stretches or snaps a link. The method of the chain going slack enough for this to happen is either the curved timing chain breaking up, or the hydraulic tensioner not working properly. The tensioner is pressurised by engine oil through a very small hole. If the plunger seizes or the hole gets blocked by crud in the oil, then it stops working. There are also instances of cars running rough due to the cam chain jumping a link on the sprocket and then throwing the timing out.
Whilst snapped timing chains on C30SE and C36GET weren't that common, they are/were a thing to be aware of. Regular oil changes reduces the risk of the tensioner getting blocked with crud, and removing the tensioner occasionally to check it is still free to move (say at 15-30K mile intervals) is IMHO the best way to be safe.
AFAIK it was never a problem on the 12V with it's duplex chain.