I actually re-tried this with the pre-fix version I still had and it was the same, so yeah I guess that one's out. Sadly, pixi 5 is kind of needed for the performance boost since I'm making a 3d DRPG in MV3D; without it I chug on 20-30 FPS in my 3D dungeon spaces.
But no worries, the other stuff is still worth the price, especially the glowing auras for my enemies in specific states, so thanks for your support and plugin.