Not having much luck finding the issue in JIRA. Basically #7274 is refusing to compile my 6.0.5 project that compiles without a problem. It's failing to find a package on compilation but the error color coding and navigation have no problem finding the classes in the editor. It just won't compile.
The dependency causing the problem looks to be on an exported module, more specifically it's in a marked test directory under that module.. hoping the rules haven't changed to exclude test code from module exports..? Strangely adding the module as a direct dependency of the failing module (rather than relying on the export) still fails?