[1.5 and earlier] Engine Groups bar is wrong about progress

[LameFox]

1.5, English, no mods, 3rd start

For a long time now, when I go to order a new ship of size L or XL, the bar that indicates all slots are filled is wrong about engine groups. Using example of an L sized gas miner Crane at MIN shipyard, I select engines and the best shield for each slot, and the bar is like 1/3 or 1/4 of the way up, as if there's something missing. If I select the highest preset, that will usually make it go all the way to the top, at which point I go back and check only to find that it has chosen the same things I did. And after I've done that, I can add and remove shields and the progress will change accurately, reaching the top with 3 installed.