OP, I wish I'd seen this sooner. I've been lifting for about two years with a breast reconstruction after having bc in my early 30s, chemo, rads, the works.
The chemo and rads destroyed my body composition and I got into lifting because doing the stuff I used to do - mostly cycling related - didn't work anymore. I had to build the foundation back up.
i had lymph node involvement and everyone freaked me out that I was going to give myself lymphedema (swelling problems) by lifting so I have gone super slow but I have dumbbell bench in my routine. I still do pretty low weight/ high volume, but bench, OH press, up rows, have all been fine for me.
I think most of it depends on your situation so definitely work with your onco team. I had a previous foundation of health and I was really young for breast cancer so most of the advice out there made assumptions that did not apply to me. Everyone is different.