Starport & cloak research issue

Hello, I recently added some code into my python-sc2 library based bot and when banshee cloak started to research, my starport lifted up but cloak continued to research and eventually finished.

Seems to be a bug

``` async def build_banshee_and_cloak(self):
for sp in self.units(STARPORTTECHLAB).ready.noqueue:
if not self.already_pending_upgrade(BANSHEECLOAK) and self.can_afford(BANSHEECLOAK):
print("researching cloak!")
self.combinedActions.append(sp.research(BANSHEECLOAK))```

The only entry point named is build_banshee_and_cloak in the reported python-sc2 bot code; begin by reproducing the Starport lift and Banshee cloak-research sequence and tracing how the research action is submitted. Done means the behavior is explained and the corrected outcome is covered by a regression test, but the payload names no repository files or tests.

Written by the indexing model from the issue text.