Dashboard errors via Tailscale - refreshing / resetting

Has anyone using Tailscale seen their dashboards starting to “flicker” recently? It’s as if the page is trying to reload itself. This is happening both in the iOS companion app and on Firefox desktop. It does NOT happen via the NabuCasa subscription, nor when accessing my docker container on the local network via IP address and port.

Running the same dashboard via Tailscale and NabuCasa side-by-side the only difference I see is that the tailscale version will occasionally throw this:

Error while fetching an original source: request failed with status 404
Source URL: https://<my_url>/unknown/node_modules/home-assistant-js-websocket/dist/connection.js