That also happened to me. My Surgeon told me I had clear margins and no more tissue needed to be taken out after my lumpectomy and when I went to my Oncology appointment, he strongly recommended I have more taken out. So I went for my 3rd surgery in 2 months. But I did switch surgeons for my last one.
It’s definitely frustrating when you are told one thing from one doc and then are blindsided when meeting with another doc.

I might have missed this, but was your Oncotype test for DCIS? Or an invasive cancer?