Dear Mojangteam,
A Pillagerraid appeared on my Nintendo Switch. I killed all Pillager but a new raid appeared. After the destruction of the 2nd raid a third and a fourth as well as a fifth appeared (on the display it was said to have defeated him each time) Appearance of a new raid I had no bad omen effect, I hope that the bug will be fixed soon. Have a nice day.
The entire gimmick of Raids is the multiple waves. There is no bug here, just the intended mechanic.