I managed to resolve my issue.
I discovered my plugin was sharing memory space in its process function (said plugin is an instrument that synthesizes audio into its given output buffers). By moving from namespace scoped variables into a class based processor this issue was resolved (long story short: buffers were overflowing between instances wreaking havoc). While this was somewhat tolerable as a VST3 in Bitwig (though very loud), as a VST2.4 this would instacrash while the problem was apparent all along. Guess it pays off to make sure your code is actually working, cough.
Hope this is of help to the others who posted here.