I am having this problem as well. A game that I have already completed and released using 4.14 now crashes when I build out the 32-bit version from 4.15.
The crash occurs immediately upon trying to launch a 32-bit version of the game on a computer with an AMD 7500 GPU. It still works fine on a computer with an NVIDIA 960, but not the AMD 7500. The 32-bit version of the game worked fine when build from 4.14, so this looks like a new bug.