Hello,
While trying to build a base in 1.4.3, I've experienced a bug impacting multiple workshop set to boost an assembly plant. I was told it was an issue with how the bay system works so I've waited for it to be redone. I have installed the last Constellation pack on ksp 1.5.1 with the converter update, did some test and it seems the bug is still present . The amount of Mk produced by the boosted assembly line seems absurdly low : https://imgur.com/gallery/QXM1KcN
Ps: btw there are a lot of mods on the screenshot but i've tested it on a clean install with a new save and it still happens.