Hi I think I may have found a bug with Battle Engine Core and your plugin.
What seems to be affected is the casting motion with spells. With your plugin placed underneath, the casting motion always uses the physical casting animation. If placed above battle engine core, the casting motion is fixed but other plugins get kinda wonky like the Yanfly ATB. Hopefully you can find a fix, thank you.
Without your plugin and what should normally happen when casting magic
With plugin installed