Weird DOMException errors when testing worker with `--remote`

This happens when a worker is running on CF, via the --remote flag, and I make a change to my code. The error appears without me making a request to my worker - it appears immediately after I save the file with my changes. It doesn't always happen, and there seems to be no pattern about the sort of code changes that trigger it.

The error message itself is unhelpful. Anyone know what's up here?

Thank you.
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