This happened to me. Company was on the verge of extending me an offer for a full time position. Hiring manager and team loved me. Then the CTO pulled some bullshit and the offer became one for a 6 month contractor, not a FTE.

I took the job anyways because I was desperate (had just been laid off). But I continued interviewing every chance I got and jumped ship at around the 5 month mark. The CTO was livid that I abandoned ship.