lib/model, lib/protocol: Fix file comparisons (fixes #8594) (#8603)

lib/model/folder.go

@@ -601,14 +601,15 @@ func (b *scanBatch) Update(fi protocol.FileInfo, snap *db.Snapshot) bool {
 			b.Remove(fi.Name)
 			return true
 		}
-	case gf.IsEquivalentOptional(fi, protocol.FileInfoComparison{
-		ModTimeWindow:   b.f.modTimeWindow,
-		IgnorePerms:     b.f.IgnorePerms,
-		IgnoreBlocks:    true,
-		IgnoreFlags:     protocol.FlagLocalReceiveOnly,
-		IgnoreOwnership: !b.f.SyncOwnership,
-		IgnoreXattrs:    !b.f.SyncXattrs,
-	}):
+	case (b.f.Type == config.FolderTypeReceiveOnly || b.f.Type == config.FolderTypeReceiveEncrypted) &&
+		gf.IsEquivalentOptional(fi, protocol.FileInfoComparison{
+			ModTimeWindow:   b.f.modTimeWindow,
+			IgnorePerms:     b.f.IgnorePerms,
+			IgnoreBlocks:    true,
+			IgnoreFlags:     protocol.FlagLocalReceiveOnly,
+			IgnoreOwnership: !b.f.SyncOwnership && !b.f.SendOwnership,
+			IgnoreXattrs:    !b.f.SyncXattrs && !b.f.SendXattrs,
+		}):
 		// What we have locally is equivalent to the global file.
 		l.Debugf("%v scanning: Merging identical locally changed item with global", b.f, fi)
 		fi = gf