Proposer stucks with Error: Proposing operation error failed to propose transactions: failed to propose transactions: transaction reverted

[davaymne]

What:
Proposer stucks with Error: Proposing operation error failed to propose transactions: failed to propose transactions: transaction reverted

Prover/Proposer: 0xfbfd4F6993BC0D3481B9bf61AD0892f817a2e7aC

Background:
I deposited 2.5 TTKOj on contract and started Proposer and Prover.
I could see that Propser proposed a block and Prover proved it (2.5 -> sent to contract, and 3 <- got back from contract)
And then got "slashed" all 2.5TTKOj - I did not get why.

ok.. then I deposited another 2.5 TTKOj.
Have seen that I Proposed and Proved again 2 x blocks, but bond 2.5 was not released back and Proposer got stuck.
Proof generated time is ±4 min

I beleive that Proposer is getting this error because of not enough bond.
But: When there is not enough bond it says different error right?

Did not get this log:

INFO [09-20|21:03:12.947] Cancel proof generation for block        blockId=18407
INFO [09-20|21:03:15.884] "💰 Your block proof was accepted"        blockID=18407 proposedAt=1,695,243,540