Update: went past the outpost and two were in the tower! Put bed down as night and they disappeared - de-spawned! So they could be spawning but then de-spawning minutes after, I waited until night again and two more spawned so I quickly ran in and killed the captain to get the raid and it worked. The other one disappeared. There is still an issue but at least I can get the raid. BUT when the raid started the first wave spawned about 50 blocks down in a cave! They didn't wonder into it (as that has happened before) they spawned way down in it. Eventually found them and killed them but the raid reset........ahhhhh!! ************!!!!!!!!??😞
Oh my god, thank you. I can't believe that was it! I have no idea how that would cause it, but after closing discord Minecraft fixed, so thank you!
Also the same for me. Terracotta error. I've upgraded to 1.17.34 and the issue is not resolved.