Same deal. You’re heaping build stress on top of build stress. You’ll probably be better off running a specialty plan, THEN doing a “rebuild” if you want because the specialty plan will necessarily taper you and allow enough recovery before going back into a build. Base - Build - Build is a good way to burn yourself out considering that TR’s builds are all 8 weeks long. Traditional periodized training models have you do 8 weeks of build before a Peak phase. I’d recommend one of the following:
SSB 1/2 -> Build -> Specialty -> Build -> Specialty … SSB1/2
SSB 1/2 -> Build -> SSB 1/2 -> Build -> Specialty
I would not personally recommend back to back build phases.