GetHashFn return two different hash values for one same block

[KamiD]

System info: [Include Ethermint commit, operating system name, and other relevant details]
commit : 6e1c166

Steps to reproduce:

1. [First Step]
   Calling GetHashFn(100) when current block height is 100
2. [Second Step]
   Calling GetHashFn(100) when current block height is 101
3. [result]
   There has two different hash value returned

Root cause:
after PR #538 merged, the hash of (height -> hash mapping) has changed from types.HashFromContext to req.Header.LastBlockId.GetHash()
But the code of GetHashFn was still using types.HashFromContext when getting hash for current block height:

func GetHashFn(ctx sdk.Context, csdb *CommitStateDB) vm.GetHashFunc {
	return func(height uint64) common.Hash {
		switch {
		case ctx.BlockHeight() == int64(height):
			// Case 1: The requested height matches the one from the context so we can retrieve the header
			// hash directly from the context.
			return HashFromContext(ctx)

		case ctx.BlockHeight() > int64(height):
			// Case 2: if the chain is not the current height we need to retrieve the hash from the store for the
			// current chain epoch. This only applies if the current height is greater than the requested height.
			return csdb.WithContext(ctx).GetHeightHash(height)

		default:
			// Case 3: heights greater than the current one returns an empty hash.
			return common.Hash{}
		}
	}
}

Expected behavior: [What you expected to happen]

Actual behavior: [What actually happened]

Additional info: [Include gist of relevant config, logs, etc.]

[KamiD]

result of HashFromContext is same as req.Header.LastBlockId.GetHash(), closed