Hi there!
I don't know if I will be able to take a look into this today and on the weekends I'm not always around. Some things that may help:
1 - Having the most updated EliMZ_Book version. Which is 6.1.2.
2 - Make sure EliMZ_Book is somewhere above the EliMZ_Map Transitions
3 - Download the plugin again, it now does have the Pixi-filters file. And it should be above EliMZ_Book(the pixi file!)
If you do everything above, and still don't manage to make it work, create a sample project replicating the error, upload it somewhere, and send it to me on my discord: hakuenstudio or my e-mail: hakuenstudio@gmail.com
Don't send the link here.
I will take a look into it and let you know.