New
#40
If the CU requires a Servicing Stack update then it gets applied in the RP ring. I said it was one of the causes the other was that they didn't listen to what some insiders were saying. The RP ring is the final chance to catch issues before it goes to the general public. They were so desperate to get it out during their conference that they omitted this step on 1809. Mind you even though issues were still there in 1903 RP such as the Battle Eye problem they still went ahead with 1903 presumably because they had pre-announced late May as the release date and there was a fixed version out there. The USB issue occurred I think only with the last CU in RP when presumably the decision to release had already been made.
Edit: The only CUs that are not released to RP early are security ones.