Raids not starting in Minecraft MCPE

I did a copy of my world and deleted the original version. Now, every time i drink an ominous bottle in a village or in my raid farm, I get the raid omen and the raid bar appears, but a one pixel from the end, it freezes then dissapears. Because of this, getting totems of undying is impossible unless going in a woodland mansion. Could you fix it quickly please ? Thanks. (I am on an iPad 9th generation btw)