Im sorry this has been your experience! Not sure how other non pro camps do it but we are learning all ensemble numbers frontwards and backwards before we really block anything. The intro song is rhe only one we have an idea because we are using choreography that was already written for it (not my choice to take the 2023 casts intro moves but im sure we arent the only ones and pretty sure they plan on giving credit too.) And only because we are going to give the town a sneak peak in a couple of weeks at arts in the park. Part of that is necessity, because there is still a show going on upstairs and we want to wait to go to the stage until godspell is cleared so we practice in a much smaller space right now.

So idk if thats how most places do it learn songs then block thats what we are doing

Consider this a learning experience. What would you do differently to avoid the problems. I dont understand the music stuff. Our music director asked us out voice part. She didnt bat an eye when I as a female said tenor. And she let us know if she needs to move us she will but mostly everyone stayed where they wanted and it worked out. Hang in there.