Stepts to reproduce:
1) Place a non-standard quality building when you only have 1 of them in your inventory
2) Use pipette tool (q) to get a ghost copy of the same quality building in your cursor.
3) Place a ghost.

So long as you have ANY QUALITY of that building in your inventory, it'll place the same quality as the ghost. E.g. if you place a ghost of a legendary turret and have only standard turrets in your inventory, it'll spontaneously change one your standard turrets into a legendary one.

Haven't actually tested with non-standard quality items, so unsure if it'll downgrade, but upgrading standard to any quality is a pretty huge exploit.

Hi! Thanks for the note. I'll fix it soon!

Stepts to reproduce:
1) Place a non-standard quality building when you only have 1 of them in your inventory
2) Use pipette tool (q) to get a ghost copy of the same quality building in your cursor.
3) Place a ghost.

So long as you have ANY QUALITY of that building in your inventory, it'll place the same quality as the ghost. E.g. if you place a ghost of a legendary turret and have only standard turrets in your inventory, it'll spontaneously change one your standard turrets into a legendary one.

Haven't actually tested with non-standard quality items, so unsure if it'll downgrade, but upgrading standard to any quality is a pretty huge exploit.

Would it be a bother to send me a save file in which the inventory will contain a wide variety of objects of varying quality, so that I can solve the problem faster?)

I can confirm this exploit. You just need to have normal quality building in your inventory and before you place it you can use "increase quality" shortcut to change it to higher quality. It only works from normal to higher quality. You cant downgrade anything this way or go from uncommon to higher quality

Would it be a bother to send me a save file in which the inventory will contain a wide variety of objects of varying quality, so that I can solve the problem faster?)

Apologies, but I'm currently on holiday away from my PC (hence the late reply). I'll be back in few days, but I expect you'll be able to set up a test by then.

Would it be a bother to send me a save file in which the inventory will contain a wide variety of objects of varying quality, so that I can solve the problem faster?)

Apologies, but I'm currently on holiday away from my PC (hence the late reply). I'll be back in few days, but I expect you'll be able to set up a test by then.

I've added this fix to the code, but I can't test it right now.
I'm playing the game with friends and can't tear myself away)).

Here’s a preliminary version that should theoretically fix the quality bug. Or an error might occur when trying to do this.
It also includes new functionality for the upgrade plan.
I currently don't have the ability to test it.
https://drive.google.com/file/d/1KTPBSesJAs73C-i6AXsenrmeuaIeBYhN/view?usp=sharing