Protestant churches also practice Communion. But the ones I attended do it infrequently.
Yes, I think most Protestant churches practice Communion. However, as far as I know, they consider it to be a symbol and nothing more. They do not believe it has been transubstantiated into the True Body and Blood of Our Lord: what Catholics call the Real Presence.
Since the beliefs are radically different, Catholics should not receive communion in a Protestant church, and vice versa. Abstaining shows that we respect each others’ different beliefs and we do not pretend it is not important.
On the other hand, I think many of the Protestant Churches -—not all-— practice intercommunion, which means they think it good to share in each others’ bread and wine services.
If I am wrong about thus, I would gladly accept correction.