I have also experienced this problem and came here to report it. Playing on Nintendo switch. I have the turtles in an enclosure with an automatic collection system for the scutes. The system is pretty much pointless at the moment because as soon as I leave the enclosure any turtles not nametagged (adults and babies) will instantly despawn. Once I only went into the adjacent building to stamp a nametag and the adult and baby turtle were gone when I reentered the enclosure.
The game won't load.
I performed the archive and redownload trick and made slight progress. The upload bar now fills and it says upload successful however the upload window stays up with only a cancel button present. Wait a few minutes and the familiar error occurred message pops up and I'm back where I started.