Here is one edge case where you may end up switching the calendar in Ad-Din Solutions.
The committee you follow has declared that Rabi Ul Awwal will complete a 30-day cycle:
By default, the Umm al-Qura calendar may or may not have this accounted for in their calculation. Since the date correction is not supported in the Umm al-Qura calendar setting up 30th Rabi Ul Awwal may be a challenge.
While in Hijri Calendar you may be able to achieve this by adjusting the offset to either -1 or -2 to achieve 30th Rabi Ul Awwal.