The part in the build plate should be fine. I’ve found that leaving the part on the build plate throughout the finishing process (which is what Kudo3D recommends) minimizes the chance of warping.
If you’re using reactive resin, I’d be more concerned about leaving residual resin in the vat. With MakerJuice, Madesolid, or FunToDo resin, I don’t think there would be anything to worry about. I probably wouldn’t do it with Venus Creator clear, or with 3DM.