devnet: occassionally seeing error "header does not contain pre-runtime digest"

[noot]

Task summary

• occasionally on the devnet, I've seen the following error when a node tries to sync a block another node built:

EROR[11-10|23:29:05] ready block failed                       pkg=sync hash=0x7075f64377d6406f817055f833863af2f62c5ecf6b6cbb2b1b5261c42aba7e65 error="could not verify block: failed to get epoch for block header: header does not contain pre-runtime digest" caller=chain_processor.go:96

for some reason, the pre-runtime digest of the block is missing, so the node can't verify it.

there are a few possible reasons for this:

1. the block producer didn't add the pre-runtime digest. this would be really bad, and probably isn't the case, as the BABE code always adds it. however would be good to double check
2. some encoding/decoding error. potentially the block is missing the pre-runtime digest when it's being encoded on the sender side, or it's missing it when decoded on the receiver side.

[github-actions]

🎉 This issue has been resolved in version 0.6.0 🎉

The release is available on GitHub release

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