Context & versions

Hydra commit 209de1d, but any version should have this issue.

Trying to close the head we had open on preview, opened in Babbage and now to close in Conway.

Steps to reproduce

1. Open a head in Babbage
2. Network forks into Conway
3. Try to close the head

Actual behavior

Failed to post tx:

{"failureReason":"TxValidationErrorInCardanoMode (ShelleyTxValidationError ShelleyBasedEraConway (ApplyTxError (ConwayUtxowFailure (UtxoFailure (FeeTooSmallUTxO (Coin 1882369) (Coin 1746353))) :| [])))","tag":"FailedToPostTx"}

Expected behavior

• Can close the head in Conway
• An end-to-end test to have captured this

Hypothesis

The fee calculation (also for Babbage transactions) changed in Conway era / protocol version 9 to include costs proportional to reference script size. Our internal wallet seems to not incorporate that or is slightly off.

Weirdly, this was not captured by our end-to-end test that opens a head in babbage, forks into conway and closes a head again?

Could be related to the cost model; does that change when the eras are forked in our tests?