I've had two games recently where my premoves didnt register. The moves show up on my screen then I lose on time. One didn't register in 5s.
In this game I premoved king takes pawn:lichess.org/13iFYeiLnZR0
In this one I premoved pawn takes pawn:lichess.org/IJv4kgVhMQ7n
In this game I premoved king takes pawn:lichess.org/13iFYeiLnZR0
In this one I premoved pawn takes pawn:lichess.org/IJv4kgVhMQ7n