Oddly doesn’t reproduce here, (with a local project ref, but that should make no difference)
Project 'libToffee' referenced from 'ConsoleApplication36' is not in solution, reusing cached output.
D: Project Reference 'libToffee' will resolve using target 'macOS'.
Project Reference 'libToffee' was resolved to '/Users/mh/Library/Application Support/RemObjects Software/EBuild/Obj/libToffee-C3C6BD1D027EB4D0B53C6DD5BB77DA34B404C430/Debug/macOS/Device/libToffee.fx' via target 'macOS'.
can I see your project?
BBL