Bug: mintinstall doesn't show all installed apps

[Pol853]

Info
Mint 22.2
Cinnamon 6.4.8
Mintinstall 8.3.9 (updated from 8.3.8 via package on GitHub)

Description
When I click "Show installed applications", only four out of all the apps I installed through the Software Manager are shown, see the screenshot below:

[Condobloke]

I am seeing similar in Menu. Linux Mint 22.2, Cinnamon.
At first, I thought it was only apps downloaded from the web....eg balena etcher

But this is not the case.

Gnu image manipulation program (gimp) was initially downloaded from the Software Manager.
Right click on it in the menu and choose uninstall.
I am told that ""This menu item is not associated to any package. Do you want to remove it from the menu anyway ? ""
A single click on that app proves its existence.