Crash saving hidden landscape streaming level with offset

Landscape actors in a streaming level that has an offset applied and is hidden cause a crash when saving that level.

The levels window refuses to save hidden levels, but other actions (inc. "Package", "Save All", "Launch On", possibly even autosave) save the level regardless (causing the crash).

Load attached project
Make sure the "Landscape" level is hidden in the levels list
Package project from the main menu
crash