Merge pull request #33818 from hashicorp/alisdair/check-results-state…

…-compatibility-1.5

statefile: Ignore unknown check results on decode

internal/states/statefile/version4.go

@@ -525,7 +525,11 @@ func decodeCheckResultsV4(in []checkResultsV4) (*states.CheckResults, tfdiags.Di
 	for _, aggrIn := range in {
 		objectKind := decodeCheckableObjectKindV4(aggrIn.ObjectKind)
 		if objectKind == addrs.CheckableKindInvalid {
-			diags = diags.Append(fmt.Errorf("unsupported checkable object kind %q", aggrIn.ObjectKind))
+			// We cannot decode a future unknown check result kind, but
+			// for forwards compatibility we need not treat this as an
+			// error. Eliding unknown check results will not result in
+			// significant data loss and allows us to maintain state file
+			// interoperability in the 1.x series.
 			continue
 		}