Describe the bug

The limit parameter in eth_getTransactionReceiptLimited, eth_getTransactionByHashLimited, Filecoin.StateSearchMsg and Filecoin.StateSearchMsgLimited is interpreted incorrectly, causing unexpected behaviour. The parameter is meant to restrict how far back in the chain to search, but it's currently being treated as an absolute epoch instead of a relative look-back distance.

search_for_message → check_search (state_manager/mod.rs:1042)

while current.epoch() > look_back_limit.unwrap_or_default() {
    // Search backwards through chain
}