Thought it was a bug with the WaveShell at first but Auto-tune EFX 3 (which is only offered in VST3 format) also reverts back to its default state when re-opening a project.
macOS Sierra 10.12.5
FLStudio Beta Candidate 1.41 ...
added a custom bank (has not happened before). Also, when I tried to switch preset in Serum (Also custom preset) FLStudio crashed as well. This happened the first time. The second time I did the same thing it all worked. ...