Account for compute entires in backtrack code (despite it should not have reached backtracking if there is compute entry)

src/main/kotlin/ru/dbotthepony/mc/otm/matter/MatterManager.kt

@@ -564,6 +564,10 @@ object MatterManager {
 			seenItems.addLast(item)
 
 			try {
+				val indirect = Registry.indirect(item)
+				if (indirect.value != null)
+					return indirect
+
 				val result = doTryToBacktrack(item, makeCommentary)
 				cachedIterationResults[item] = result
 				return result