My son runs Minecraft 1.12.0 on an iPad Air 3rd generation, which has iOS 12.4.1.  The Minecraft app was downloaded from the App Store, and was purchased under my Apple ID and shared to this iPad through Family Sharing.

My son purchased the Minecraft Mythology Bundle from the Marketplace ($17.99) and the purchase was successful, but the iPad hangs when trying to install.  After closing Minecraft and trying to repurchase, the Marketplace indicates it was purchased and can be restored, after which the iPad hangs again.  I've left it plugged in and trying all night, and it never loads.  There are no errors listed.

Looking for advice on how to proceed. Is this a case of a mismatch between who owns the app (purchased by me under my Apple ID but shared) and who purchased the Bundle (purchased under his Apple ID)?