Migrating push notifs to new system doesn't report errors

[ara4n]

Steps to reproduce

1. turn on new notifs in labs
2. hit the proceed button on:

Update:We’ve simplified Notifications Settings to make options easier to find. Some custom settings you’ve chosen in the past are not shown here, but they’re still active. If you proceed, some of your settings may change. Learn more

3. nothing happens due to an error like Fix beta notifications reconciliation for intentional mentions push rules matrix-org/matrix-react-sdk#12510:

rageshake.ts:77 M_NOT_FOUND: MatrixError: [404] Unknown rule (https://matrix-client.matrix.org/_matrix/client/v3/pushrules/global/content/.m.rule.is_room_mention/enabled)
    at parseErrorResponse (vector://vector/webapp/bundles/e83a8712d92158de4e86/bundle.js:142497:12)
    at MatrixHttpApi.requestOtherUrl (vector://vector/webapp/bundles/e83a8712d92158de4e86/bundle.js:142888:13)
    at async MatrixHttpApi.authedRequest (vector://vector/webapp/bundles/e83a8712d92158de4e86/bundle.js:142729:24)
    at async vector://vector/webapp/bundles/e83a8712d92158de4e86/element-web-app.js:57970:7
    at async Promise.all (index 2)
    at async applyChanges (vector://vector/webapp/bundles/e83a8712d92158de4e86/element-web-app.js:57968:3)
    at async vector://vector/webapp/bundles/e83a8712d92158de4e86/element-web-app.js:57999:9

Outcome

What did you expect?

If something goes wrong, tell me.

What happened instead?

No feedback at all.

Operating system

No response

Application version

Element Nightly version: 2024050901 Crypto version: Rust SDK 0.7.0 (61b175b), Vodozemac 0.5.1

How did you install the app?

No response

Homeserver

No response

Will you send logs?

No