Workaround Marked as Solution for visibility

Here's a solution that worked for me:

You need to force push all of the blaster troopers off of the sarcophagus while leaving the scout/baton trooper up there. Then go back and save/rest to respawn all the blaster troopers.

Voila - the dropship now spawned again for me.

What an odd glitch - I thought the game was broken.