baseFeePerGas of the first mined block after anvil_reset equals block before anvil_reset

[vlad-blana]

Component

Anvil

Have you ensured that all of these are up to date?

• Foundry
• Foundryup

What version of Foundry are you on?

forge 0.2.0 (eb2141c 2023-12-20T00:44:21.180725100Z)

What command(s) is the bug in?

No response

Operating System

Windows

Describe the bug

After any "anvil_reset" rpc call, the first block that gets mined doesn't use the EIP1559 formula for the baseFeePerGas, but instead uses the last block baseFeePerGas value before anvil_reset.

The next blocks use the EIP1559 formula.
This causes not enough balance issues when mining transactions expecting the EIP1559 formula to be used for the first block after every anvil_reset

Here is an example on ethereum mainnet

anvil started with command: .\anvil.exe --fork-url "https://rpc.flashbots.net" --no-mining
eth mainnet

[mattsse]

thanks for flagging,

this was indeed an oversight in the reset impl that used the base fee of the targeted block and not the next basefee