To be able to unwrap then use the island select mode and rectangle drag to select my islands in 2D view
I drag over my islands in 2D view and they are inconsistently selected. Roughly 9 out of 10 drags selects nothing even if a single / multiple shells are within the drag region. I could drag 20 times and rarely get a shell selected. Same issue with lasso, draw poly select tool.
Steps to reproduce
Unwrap an fbx
Switch to shell selection tool
Stay in drag rectangle select mode
Drag over a shell(s) in the 2D view
Shells will usually not be selected.
It's worth noting that dragging near a shells edges or vertices greatly reduces the occurances of the issue.