Hello,
I have tested this three times now, the party get to the Dry Outpost and then I go in to the Party character sheet and click Long Rest, time zooms forward to 16:00 the next day. It tends to happen is the time they rest is after 21:00 the night before.
There are no errors in console. It doesn't happen anywhere else.
To be specific, it is after the conclusion of Dry Outpost not during it.