You're definitely right there.
I had one final straw: a backup using QRECALL which can create bootable restores. Worked and I'm up and running again.
Using the same app as before I now get:
/Applications/Spark.app
Internal File Metadata
======================
Display Name: Spark
Alt Names: Spark.app
File Type: com.apple.application-bundle
Comments:
Keywords:
Last Used: 2018-08-31 12:46:56 +0000
Raw mdls File Metadata
======================
_kMDItemDisplayNameWithExtensions = "Spark.app"
kMDItemAlternateNames = (
"Spark.app"
)
kMDItemAppStoreAdamID = "1176895641"
kMDItemAppStoreCategory = "Productivity"
kMDItemAppStoreCategoryType = "public.app-category.productivity"
kMDItemAppStoreHasReceipt = 1
kMDItemAppStoreInstallerVersionID = "828291413"
kMDItemAppStoreIsAppleSigned = 1
kMDItemAppStoreParentalControls = "4+"
kMDItemAppStorePurchaseDate = 2018-08-24 16:30:50 +0000
kMDItemAppStoreReceiptIsMachineLicensed = 0
kMDItemAppStoreReceiptIsRevoked = 0
kMDItemAppStoreReceiptIsVPPLicensed = 0
kMDItemAppStoreReceiptType = "Production"
kMDItemCFBundleIdentifier = "com.readdle.smartemail-Mac"
kMDItemContentCreationDate = 2018-08-17 11:19:35 +0000
kMDItemContentCreationDate_Ranking = 2018-08-17 00:00:00 +0000
kMDItemContentModificationDate = 2018-08-24 16:31:03 +0000
kMDItemContentType = "com.apple.application-bundle"
kMDItemContentTypeTree = (
"com.apple.application-bundle",
"com.apple.localizable-name-bundle",
"com.apple.application-bundle",
"public.directory",
"public.executable",
"com.apple.application",
"public.item",
"com.apple.package",
"com.apple.bundle"
)
kMDItemCopyright = "Copyright © 2016 Readdle. All rights reserved."
kMDItemDateAdded = 2018-08-31 11:25:21 +0000
kMDItemDateAdded_Ranking = 2018-08-31 00:00:00 +0000
kMDItemDisplayName = "Spark"
kMDItemExecutableArchitectures = (
"x86_64"
)
kMDItemFSContentChangeDate = 2018-08-24 16:31:03 +0000
kMDItemFSCreationDate = 2018-08-17 11:19:35 +0000
kMDItemFSCreatorCode = ""
kMDItemFSFinderFlags = 0
kMDItemFSHasCustomIcon = (null)
kMDItemFSInvisible = 0
kMDItemFSIsExtensionHidden = 1
kMDItemFSIsStationery = (null)
kMDItemFSLabel = 0
kMDItemFSName = "Spark.app"
kMDItemFSNodeCount = 1
kMDItemFSOwnerGroupID = 0
kMDItemFSOwnerUserID = 0
kMDItemFSSize = 109378836
kMDItemFSTypeCode = ""
kMDItemInterestingDate_Ranking = 2018-08-31 00:00:00 +0000
kMDItemKind = "Application"
kMDItemLanguages = (
de,
"zh-Hans",
ja,
en,
es,
it,
Base,
"pt-BR",
ru,
fr
)
kMDItemLastUsedDate = 2018-08-31 12:46:56 +0000
kMDItemLastUsedDate_Ranking = 2018-08-31 00:00:00 +0000
kMDItemLogicalSize = 109378836
kMDItemPhysicalSize = 47591424
kMDItemUseCount = 3
kMDItemUsedDates = (
"2018-08-30 23:00:00 +0000"
)
kMDItemVersion = "2.0.10"