Searching "portable" in the app library, doesn't find several PORTABLE apps

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1. search for "portable" in the search field, of the "all applications" section, of the App library
2. you will see that several portable apps, like "sysinternals suite", or "BD Rebuilder", for instance will not appear

expected results:
that all the apps that are portable would appear in the results

actual result:
only some apps appear, not all of them