Very plausible. As such Mexico change is very new, last October/2022.
Xojo ICU update must be done ASAP, in all releases, due to such dynamic nature of locales, time zones, language rules, date/time, currencies, etc.
After October ICU reached ICU v73 (march release). Stable with 2 minor updates. v73.2.
Since October lots of other world changes occurred too, those minor changes handle small fixes and updating those changes.
Update to the latest ICU v73.2 is extremely advisable.
Next planned version is v74.0 for October/2023.