Note: If Zebra has trouble syncing near the tip, configuring a lower download concurrency limit to 5 or less, or configuring a higher target peer set size may help.
Fixed
- The syncer no longer stalls permanently after a sync restart near the chain tip. Zebra 6.4.0 started treating blocks queued for their parent as already downloaded, so once a restart cancelled the parent's download, every later attempt to obtain new tips failed with "queued download of hash behind our chain tip" until Zebra was restarted.