I'd assume that a flooded suit is not the end of the world, other than being wet and cold. No reason one should not be able to unhappily swim it up.
It could be problematic if you have decompression obligation. Being cold while decompressing is really not a good idea. Besides hypothermia, DCS can hit in such conditions.
With my current suit (purchased second hand from ebay), I made a first test in the pool. It had some minor leaks and it got flooded underwater. Temperature was not a problem since I was in a pool, but exiting on the pool ladder with the suit flooded and with 2x12l steel doubles in the back was...mmm...interesting.
However, I cannot imagine a situation in which you have to doff it underwater. And how can you do that safely...