fix: exclude mem store from commit info (#14931)

CHANGELOG.md

@@ -265,6 +265,7 @@ extension interfaces. `module.Manager.Modules` is now of type `map[string]interf
 
 ### Bug Fixes
 
+* (store) [#14931](https://github.com/cosmos/cosmos-sdk/pull/14931) Exclude in-memory KVStores, i.e. `StoreTypeMemory`, from CommitInfo commitments.
 * (types/coin) [#14715](https://github.com/cosmos/cosmos-sdk/pull/14715) `sdk.Coins.Add` now returns an empty set of coins `sdk.Coins{}` if both coins set are empty.
     * This is a behavior change, as previously `sdk.Coins.Add` would return `nil` in this case.
 * (types/coin) [#14739](https://github.com/cosmos/cosmos-sdk/pull/14739) Deprecate the method `Coin.IsEqual` in favour of  `Coin.Equal`. The difference between the two methods is that the first one results in a panic when denoms are not equal. This panic lead to unexpected behaviour

store/rootmulti/store.go

@@ -1071,19 +1071,24 @@ func GetLatestVersion(db dbm.DB) int64 {
 func commitStores(version int64, storeMap map[types.StoreKey]types.CommitKVStore, removalMap map[types.StoreKey]bool) *types.CommitInfo {
 	storeInfos := make([]types.StoreInfo, 0, len(storeMap))
 	storeKeys := keysFromStoreKeyMap(storeMap)
+
 	for _, key := range storeKeys {
 		store := storeMap[key]
 		last := store.LastCommitID()
 
-		// If a commit event execution is interrupted, a new iavl store's version will be larger than the rootmulti's metadata, when the block is replayed, we should avoid committing that iavl store again.
+		// If a commit event execution is interrupted, a new iavl store's version
+		// will be larger than the RMS's metadata, when the block is replayed, we
+		// should avoid committing that iavl store again.
 		var commitID types.CommitID
 		if last.Version >= version {
 			last.Version = version
 			commitID = last
 		} else {
 			commitID = store.Commit()
 		}
-		if store.GetStoreType() == types.StoreTypeTransient {
+
+		storeType := store.GetStoreType()
+		if storeType == types.StoreTypeTransient || storeType == types.StoreTypeMemory {
 			continue
 		}