For every calendar in GCal, it is possible to set the default reminder behavior for timed events and all day events.
For example, notify of an event scheduled for 3pm 10 minutes before it happens (2.50p).
For all day events, notify of an event scheduled for May 14, one day before at 8pm.
(These defaults can be modified/overwritten on a per event basis on GCAL.)
Now the bug is this: all-day events created by Dynalist do not honor the defaults set in GCAL and instead set a reminder for midnight of the scheduled day.
Timed events honor the GCAL default.