I started raid, completed some waves and then slept in the village while raid red bar was filling. Then, I awoke, the raid bar was not being filling but stuck, and any mob didn't spawn. It didn't disappear nevertheless I did following behavior : leave the village and back, break all beds to be considered there is no village, sleep in bed, start another raid (raid was started successfully, but after raid was completed, it wasn't disappear), re-log-in.
I play this world with a friend. Any resource packs or behavior packs are not installed.
I cannot reproduce this to play solo. I haven't attempt to reproduce playing multiplayer.
Sleeping a bed breaks its link to any villager, and this can make the size of the village be recalculated. When the village size changes during a raid, the area that triggers the raid bar to appear does not change. It's the same when you break a bed, so I am resolving this as a duplicate of MCPE-152851.