Tip data lost when account is not linked

[Slesarew]

When submitting a tip from Polkassembly interface, if a signing account is not linked to Polkassembly identity, the title goes on chain but nothing goes to Polkassembly but placeholder.

To reproduce:

1. create an account (I used Parity Signer 5.0.1-dev android, own build with non-relevant modifications + Parity Signer Companion up-to-date version)
2. Give this account transaction cash and existential amount (I sent 1KSM)
3. do not link it in Polkassembly
4. Submit a tip while selecting this account for both fields, place any text in header and description (I used Kusama network)
5. Sign and submit
6. Check polkadot.js.org - tip is there; check polkassembly - the tip is there but empty, your tip description is lost now I suppose.

What is expected: if Polkassembly does not want to publish your text, it should not allow to submit this transaction at all or - even better - should let you link an account while submitting the extrinsic.