Hello,
I’ve found out that updating parent of an item (via PATCH boardID.type.itemID endpoint) does not work properly in a specific scenario:
You want to move an item to a frame that was created after the item was. Such operation results in adding the item to frame’s children list, but the item is hidden and invisible under or below the frame. While moving the frame, the item moves along. It is also very inconvenient to bring this item back to the foreground.
Updating parent works correctly only when trying to move an item to pre-existing frame.