RubyMine cannot find Gem binaries for Docker Compose remote

I have a working docker compose set up. But when trying to use this as my working remote for development (through Preferences, Languages & Framework, Ruby SDK and Gems", New remote.., Docker Compose) after a couple of "Docker Compose Up" notifications, it fails with "Can't create Ruby SDK, Could not find gems binaries directory".

What to do? Is there a way to specify a directory somehow?

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