core/diff: Fix attribute mismatch with tags.%

terraform/diff.go

@@ -488,7 +488,7 @@ func (d *InstanceDiff) Same(d2 *InstanceDiff) (bool, string) {
 			// Similarly, in a RequiresNew scenario, a list that shows up in the plan
 			// diff can disappear from the apply diff, which is calculated from an
 			// empty state.
-			if d.RequiresNew() && strings.HasSuffix(k, ".#") {
+			if d.RequiresNew() && (strings.HasSuffix(k, ".#") || strings.HasSuffix(k, ".%")) {
 				ok = true
 			}
 

terraform/diff_test.go

@@ -595,6 +595,38 @@ func TestInstanceDiffSame(t *testing.T) {
 			true,
 			"",
 		},
+
+		{
+			&InstanceDiff{
+				Attributes: map[string]*ResourceAttrDiff{
+					"reqnew": &ResourceAttrDiff{
+						Old:         "old",
+						New:         "new",
+						RequiresNew: true,
+					},
+					"somemap.%": &ResourceAttrDiff{
+						Old: "1",
+						New: "0",
+					},
+					"somemap.oldkey": &ResourceAttrDiff{
+						Old:        "long ago",
+						New:        "",
+						NewRemoved: true,
+					},
+				},
+			},
+			&InstanceDiff{
+				Attributes: map[string]*ResourceAttrDiff{
+					"reqnew": &ResourceAttrDiff{
+						Old:         "",
+						New:         "new",
+						RequiresNew: true,
+					},
+				},
+			},
+			true,
+			"",
+		},
 	}
 
 	for i, tc := range cases {