fix(anvil): return correct data for queries at forked block

[klkvr]

Motivation

Closes #4700

This is similar to #4140, however, 4140 was always initializing AtGenesisStateDb with self.db. Thus, all queries at fork_block were returning data from latest state.

It seems that we can safely use states[fork_block], because snapshots recorded in do_mine_block already contain inserted genesis accounts

foundry/crates/anvil/src/eth/backend/mem/mod.rs

Lines 956 to 958 in 5b84163

	let db = self.db.read().await.current_state();
	// store current state before executing all transactions
	self.states.write().insert(best_hash, db);

however, I might be missing something

Solution

[mattsse]

nice