Hey! Currently experiencing heartbeat errors aswell, even though, they're not the same as OP had.
My error looks like the following:
Sending heartbeat...
Could not send heartbeat to nix! Error was: [json.exception.parse_error.101] parse error at line 1, column 1: syntax error while parsing value - invalid literal; last read: '<'
The server ran just fine before, I was able to join it and whatnot. I haven't changed anything in the config ever since.
EDIT: Resolved itself, just had to update the plutonium binaries, didn't realize the latest update.
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