fix: fix relation joins batch crash (#5630)
[TML-1489](https://linear.app/prisma-company/issue/TML-1489/fix-crashing-relationjoins-batches)
Fixes https://github.com/prisma/prisma/issues/28213
Fixes https://github.com/prisma/prisma/issues/26827
Tested in https://github.com/prisma/prisma/pull/28235
