I've the same issue - Alfred can't find several apps in my /Applications folder. Using Alfred Metadata I'm getting:
/Applications/Sourcetrail.app
Internal File Metadata
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Display Name:
Alt Names:
File Type:
Comments:
Keywords:
Last Used:
Raw mdls File Metadata
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kMDItemFSContentChangeDate = (null)
kMDItemFSCreationDate = (null)
kMDItemFSCreatorCode = ""
kMDItemFSFinderFlags = (null)
kMDItemFSHasCustomIcon = (null)
kMDItemFSInvisible = 0
kMDItemFSIsExtensionHidden = (null)
kMDItemFSIsStationery = (null)
kMDItemFSLabel = (null)
kMDItemFSName = (null)
kMDItemFSNodeCount = (null)
kMDItemFSOwnerGroupID = (null)
kMDItemFSOwnerUserID = (null)
kMDItemFSSize = (null)
kMDItemFSTypeCode = ""
Application (SourceTrail) can be found on github: https://github.com/CoatiSoftware/Sourcetrail