Ideas
I noticed this bug with pumping a couple months ago. It happens quite often for me. It's like the pump inputs doesn't register until you restart the game (R2, L2 and left stick release inputs). It completely stops you from being able to pump. I've seen no other posts about this online, so not sure if anyone else has noticed? Maybe I've just been unlucky.
My theory is that it's an issue between the client to server connection. Like the game thinks you're offline or something? Because other things related to online stuff seem to bug out as well while it's happening. Due to the crazy amount of people flooding the servers today, connection is a bit more unstable. The issue is probably just cropping up WAY more often now.... This bug is incredibly frustrating.