The Pure Maps app on FlatHub have recently had an update, which included dependency change of org.kde.Platform dependency from version 5.15-24.08 to 5.15-25.08. There was no such problems before the update, so the problem is with the app build, not with the PureOS. not with an update of something from PureOS.
There are similar glitches in other apps from FlatHub, and there is a theory why:
I suppose we now have a similar problem with QT.
The good news is that in this particular case we still can downgrade from FlatHub’s version 3.5.1 of PureMaps to one of its previous versions from FlatHub, or even to version 3.1.1 from the PureOS flatpak repo.
If anything, I hope their work on GPU drivers may fix bugs in existing API implementation as a collateral.