Creative Ad Units Not Working 300x250 + 300x600

[codejunk2017]

First,

I really like this code and great work on it.

Having a issue with loading multiple size units. DFP has an option to override sizes but can't seem to get it to work with this plugin.

I am able to pull the tag with no problem but the tag is a creative and can push either 300x250 OR 300x600. Not matter what I do it only shows the 300x250 size but it showing a 300x600 in the background. Anyone have some input on this?

I did set data-dimensions="300x600,300x250" with no luck.

Thanks