diff --git a/Libraries/LibJS/Runtime/Temporal/AbstractOperations.cpp b/Libraries/LibJS/Runtime/Temporal/AbstractOperations.cpp
index 3223eb696f9..1063561a565 100644
--- a/Libraries/LibJS/Runtime/Temporal/AbstractOperations.cpp
+++ b/Libraries/LibJS/Runtime/Temporal/AbstractOperations.cpp
@@ -1017,7 +1017,9 @@ ThrowCompletionOr<ParsedISODateTime> parse_iso_date_time(VM& vm, StringView iso_
             // 4. If goal is TemporalMonthDayString and parseResult does not contain a DateYear Parse Node, then
             if (goal == Production::TemporalMonthDayString && !parse_result->date_year.has_value()) {
                 // a. Assert: goal is the last element of allowedFormats.
-                VERIFY(goal == allowed_formats.last());
+                // FIXME: Spec issue: This assertion is possibly incorrect.
+                //        https://github.com/tc39/proposal-temporal/issues/3045
+                // VERIFY(goal == allowed_formats.last());
 
                 // b. Set yearAbsent to true.
                 year_absent = true;
diff --git a/Libraries/LibJS/Runtime/Temporal/ISO8601.cpp b/Libraries/LibJS/Runtime/Temporal/ISO8601.cpp
index 60cbd93b55d..852d35fdc53 100644
--- a/Libraries/LibJS/Runtime/Temporal/ISO8601.cpp
+++ b/Libraries/LibJS/Runtime/Temporal/ISO8601.cpp
@@ -199,7 +199,16 @@ public:
         // AnnotatedTime :::
         //     TimeDesignator Time DateTimeUTCOffset[~Z][opt] TimeZoneAnnotation[opt] Annotations[opt]
         //     Time DateTimeUTCOffset[~Z][opt] TimeZoneAnnotation[opt] Annotations[opt]
-        (void)parse_time_designator();
+        auto has_time_designator = parse_time_designator();
+
+        if (!has_time_designator) {
+            StateTransaction transaction { *this };
+
+            // It is a Syntax Error if ParseText(Time DateTimeUTCOffset[~Z], DateSpecMonthDay) is a Parse Node.
+            // It is a Syntax Error if ParseText(Time DateTimeUTCOffset[~Z], DateSpecYearMonth) is a Parse Node.
+            if (parse_date_spec_month_day() || parse_date_spec_year_month())
+                return false;
+        }
 
         if (!parse_time())
             return false;