Exploit: Keep turrets on command stations types that don't support them

[TechSY730]

When switching a command station from one type to another, buildings the previous command station could provide the new one doesn't aren't scrapped. This means you can get, for example, beam turrets with an economic command station without battlestations. Buildings/units the new command station does have but has a smaller cap does scrap excess units as expected.

I am a bit sad to report this, as my current defense uses this exploit, but it clearly isn't intentional behavior.

https://bugtracker.arcengames.com/view.php?id=21231

To reproduce:

• Take a planet, build a military command station on it.
• Build 2 factories, a beam turret, and a sentry
• Replace the command station with an economic command station

Expected:
One factory, all beam turrets, and all sentries are scrapped

Actual:
One factory is scrapped. The beam turret(s) and sentry(s) remain because the economic command station doesn't provide them

Also works with logistic command station and mines

[x4000]

Thanks for this!  Do you have a savegame with an easy repro case?  I'm just trying to blitz through things, and so trying to avoid spending too much time setting up repros.  I really appreciate it!