Summer as a non-penultimate

Hi guys I interned at a BB last summer and got a return offer (a MO/BO role). The FT starting month is pretty late and I can afford another summer internship before full time. I want more internships to explore and get more experience so that I could increase my chance for internal transfer opportunity in the future. However, most BB hires penultimate students so I have to "delay" my graduation by a semester. I do not plan to delay my graduation but I will write it on my resume. If not, the system would automatically disqualify me. Is it unethical to do this? Are BBs very particular about graduation month? Thank you guys!