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WIN (CMD or SUPER) keys are sent as ALT to Linux (from Mac)

I cannot send any Win key combination (a.k.a CMD in MacOS and SUPER in linux). Instead of Win, the Alt modifier is sent, for example CMD-C shows up as ALT-C on Ubuntu.

I'm running the latest version (14.2 on Mac Mojave and 14.1 on Ubuntu 18.04).