Hey Sean, I have this same issue and the work around that KovaaK has given me does not fix the errors while packaging. I also do not have any repro steps but this is a very large project that my team has spent a lot of time on and we desperately need to build. The blueprint shows no compilations errors but the packaging process (regardless of platform) will say that there are compiler errors.
Using KovaaK’s workaround actually resulted in me getting a warning saying that the compilation of the blueprint was successful with warnings and at the same time an error saying there was an error with compiling that blueprint.
Edit: Using 4.10.4