Yes, I have the same problem with all-day events spilling over into the next day (so a one day all-day event is shown incorrectly as an all-day event for two days).
I had assumed, maybe wrongly, that this was the same, or similar problem, as the issue above, but maybe it’s not.
Technically I suppose an event that runs from midnight to midnight is a two day event (by one minute) and therefore Sailfish is correct to display it as such.
However if this is the accepted practice for representing an all-day event by everybody else then it probably makes sense for Sailfish to recognise this, ignore the single minute overspill and show it as a single all-day event.
At least then the synchronisation would work for this type of event.