This drawing has some connectors connecting two boxes:
If I group the entire bunch of stuff and flip it vertically, several of the arrows don’t move as they should. They’re definitely still part of the group, as shown when I click them to select, as first it selects the group, and then I have to click again to select them individually. They also move with the group.
Curiously, when I do select them individually, the blue/red origin/destination diamonds appear where they should!