I did a little debugging on this today and found that the following functions in the Time class call localtime, a C-library function, which calls malloc_r (via localtime_r, _tzset_unlocked, _tzset_unlocked_r).
hourhourFormat12minuteseconddayweekdaymonthyeartimeStr
I’ve added it to our backlog with high priority. Not sure of the best way to fix and may need to wait until Mat gets back from vacation.