Build failed in XCode unless using Beta

Hello,

Recently we've started to come across this issue when building in XCode 11.6:

Code (CSharp):

1. could not reparse object file in bitcode bundle: 'Invalid bitcode version (Producer: '1200.0.26.2.' Reader: '1103.0.32.62_0')', using libLTO version 'LLVM version 11.0.3, (clang-1103.0.32.62)' for architecture arm64 clang: error: linker command failed with exit code 1 (use -v to see invocation)

I believe this is telling me that something was produced for XCode 12.0 (beta) and it can't be passed in an earlier version of XCode (11.6 - the latest version of XCode we can use to publish apps?)

I'm currently in a process of going through deleting things from the project to try and find whats causing this issue but if anybody knows a faster way to do this or a workaround, let me know!