I've had this same issue man, I'm on my second aftermarket clutch. My first one was a FX350 and I had no issues with it at all (other than just not liking it's daily driveability).
I then switched to a FX200 and after install I initially got locked out of 1st and reverse and the car was undriveable, I'd have to turn it off to disengage. Bleeding it and replacing the slave didn't fix the issue, only the shim kit did.
That fixed it for 99% of the time, only rarely I'll have it kinda "stick" in 1st or reverse where it doesn't want to let go and I need to wiggle it or slip the clutch for a second but it doesn't get completely stuck anymore.
I've read up on it and it seems to be a common experience with many aftermarket clutches kinda sticking in 1st or reverse, not sure why though.