Power BI Embedded registers blocked unload handler in Microsoft Edge

This is almost certainly Chromium's ongoing unload event deprecation surfacing in a script you don't control, rather than anything wrong in your embedding code. The warning names the Power BI hosted reportembed script specifically, and Edge/Chrome have been tightening enforcement around unload listeners for a while now as part of the back/forward-cache work — sites still get flagged even when the listener is legitimate.

In practice this is usually just console noise rather than a functional break — the report itself still renders and works, per what you're already seeing. Worth double-checking that nothing real regressed (state not saving on close, telemetry gaps) before spending more time on it, since a console warning alone doesn't tell you whether anything actually stopped working.

Since the listener lives in Microsoft's own script rather than your application code, there's no fix you can apply from the embedding side — you'd only be able to suppress the console noise, not the underlying registration. If it's bothering you beyond cosmetics, the powerbi-client-sdk-typings / JavaScript SDK GitHub repo is the right place to check for an existing issue or file a new one; I don't have visibility into whether Microsoft has already shipped a pagehide/visibilitychange replacement in a recent SDK version, so that's worth confirming directly rather than taking on faith.