Plasma browser integration fails to update

I’m running KDE Neon, and plasma-browser-integration has failed to update since the move to Plasma 6.4.

My browser-integration is stuck on 6.3.5, and any time I update (either from Discover or pkcon), I get this:

sudo pkcon update plasma-browser-integration

Resolving                               [=========================]         
Testing changes                         [=========================]         
Finished                                [                         ] (0%)  
The following packages have to be updated:
 plasma-browser-integration-6.4.1-0zneon+24.04+noble+release+build29.amd64      Chromium integration for Plasma
Proceed with changes? [N/y] y

                                        [=========================]         
Updating packages                       [=========================]         
Loading cache                           [=========================]         
Running                                 [=========================]         
Installing packages                     [=========================]         
Finished                                [=========================]         
Fatal error: Error while installing package: unable to open '/usr/lib/mozilla/native-messaging-hosts/org.kde.plasma.browser_integration.json.dpkg-new'

Everything else is perfectly fine and up to date. For a little while after the move to Plasma 6.4, the browser integration still worked, but I guess now everything has moved passed it, and it can no longer run at all.

I’ve checked /usr/lib/mozilla/native-messaging-hosts/, and the directory has the json manifest, bu why is it expecting to find the dpkg there???