BBC News App not updating back to last compatible version (iPad Mini 3)

I have an iPad Mini 3 running on software version 12.5.7

Recently, when I open the BBC News App, message comes up on the screen saying: "App Version Expired" with more text underneath reading "The installed version of the BBC News App is out of date. You must update it from the App Store." along with two options of Cancel (which takes me to a blank red loading screen of the app) and App Store (which for some reason takes me to my home screen).

When I go to the BBC News App on the App Store app, the Update button gives me the following message: "Download an older version of this app? The current version requires iOS 13.0 or later, but you can download the last compatible version."

When I tap on download in this prompt, this prompt box disappears for less than a second and then comes back with the same message, in a recurring manner.

Any suggestions?