Invaders spawned from Castles initially "flash" at full size before their spawn animation kicks in and scales them up from 0

[bilalakil]

You can see it happen with the second enemy that spawns in this small clip, although it's actually happening with all of them but the video capture framerate is too low to grab that. https://user-images.githubusercontent.com/6335345/172307055-b1c4d563-c620-459f-a9f8-6b8846edafca.mp4