Regtest generated coins from prev 0.16.0 version are "generated but not accepted mined" #12872

I've upgraded bitcoin core from 0.15.1 to 0.16.0 and I run it with same args for regtest on same datadir, I get balance 0 although at the 0.15.1 I had X balance . I can see on the "Transactions" tab that the mined rows are with "?" mark and tooltip with "Generated but not accepted mined" .

I expected to see the balance from the last version

To reproduce the issue:

1. run 0.15.1 with regtest
2. generate 200 in console
3. upgrade to version 0.16
4. no balance

bitcoin core version upgraded from 0.15.1 to 0.16.0 on win10 64x

Can you post the debug.log file? Can you run this again with -debug set and then post the debug.log file?

Strange. TransactionStatus::NotAccepted is set on transactions which are not in the main chain, so the blocks containing these coinbase transactions must have been re-orged out of the main chain.

As @achow101 says, this will be a lot easier to troubleshoot with the debug.log file. Are you able to upload it?

In 0.16, we changed the consensus parameters for regtest so that segwit was always active. This was mentioned briefly in the release notes https://github.com/bitcoin/bitcoin/blob/v0.16.0/doc/release-notes.md#testing-changes, along with a workaround to replicate the old behavior.

I am surprised that you're not seeing the assertion failure mentioned in the release notes, but I suspect this is the cause of what you're seeing.