Device Dehydration v2 (MSC3814) breaks passphrase reset

[akoyaxd]

Steps to reproduce

1. Enable MSC3814 on synapse (experimental_features: msc2697_enabled: false msc3814_enabled: true)
2. Enable MSC3814 flag in well-known (extra_well_known_client_content: { "org.matrix.msc3814": true })
3. Authenticate against Synapse
4. Try to reset passphrase / security key during login
5. Reset fails

Error bootstrapping secret storage Error: Device dehydration requires cross-signing and secret storage to be set up
    startDehydration rust-crypto.ts:1246
    o dehydration.ts:55
    U CreateSecretStorageDialog.tsx:387
    U CreateSecretStorageDialog.tsx:442
    React 11
    unstable_runWithPriority scheduler.production.min.js:18
    React 11
    reRender Modal.tsx:439
    createDialogAsync Modal.tsx:339
    O SecurityManager.ts:245
rageshake.ts:77:16

Outcome

What did you expect?

I can reset my passphrase / security key and with my new keys a new dehydrated device gets created.

What happened instead?

I see an error message that tells me that the secure storage could not be created.

Operating system

All

Browser information

Firefox 129

URL for webapp

app.element.io

Application version

1.11.77

Homeserver

Synapse 1.114.0

Will you send logs?

Yes

[raphaelbadawi]

Same here.

[richvdh]

I was unable to reproduce this; I suspect it means that something else went wrong during the reset process, but I'd be guessing, really.

(I did discover a different problem: #29130)

If anyone is able to reproduce this, please upload debug logs from within the application. For now, I'm closing the issue.