Confirmed this issue still happening in Minecraft Bedrock 1.21.132.
After successfully defeating 1 or 2 waves, the Raid bar fills up but then goes away when full instead of the next wave. This has happened at the raid farm where all villagers and beds are safe from raiding party.
Additional info: At my raid farm I started 5 raids using the regular Bad Omen (level 1) bottles. The first two raids had no issue, but raids 3 - 5 stopped after the 2nd or 3rd wave. In all instances, the Raid bar built up inbetween the waves but once full it dissapeared completely instead of triggering the next wave.