Molds Systemic once it gets into the stem the buds are are infected even if you don’t notice it.
Its obvious your plants got a fungal disease
You ruled out bugs there’s only it being fungal
The leaves have white dots on them
There’s white on the stem
There’s rot on the branches and it’s main stem looks infected from the very bottom
Even if you harvest it your going to have to wash them with
hydrogen peroxide mixture
I think it’s a diseased plant do you really want to smoke it knowing it has a disease
I appeal to you as I once smoked a moldy plant & thought I was only picking off the good bits & nearly collapsed lung.
If you do as said you will have to wash them
Milk might be useful there’s thread on treating mold with milk I didn’t suggest earlier as I wasn’t 100% it’s mold n not bugs
There’s also a thread about washing with milk
@GNick55 I wish he’d pop in & tell you about cleaning it up as he’s done it a lot but he’s staff & gets so many notifications plus he’s not always on