bug: `LatestBlock` not usable on restart

[Dodecahedr0x]

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The task scheduler uses LatestBlock to get the blockhash when sending transactions. On restart, it fetches previously scheduled tasks and immediately executes them if they are overdue.

However, this results in transactions failing with BlockhashNotFound. It appears that the LatestBlock blockhash is not properly loaded on restarts.

Commit / version

master

Environment

No response

[0xzrf]

@Dodecahedr0x I think this PR should fix this:
#1332