Time Machine ignoring migrated Photos library
Five years ago I upgraded my iMac to High Sierra and in doing so was prompted to migrate my iPhotos library to Photos. Since then I've been using my iMac as before, with Time Machine as my only backup.
Last night I added 12GB to my Photos library from another source and noticed that when Time Machine ran only a few MB were updated. After further investigation it seems that Time Machine completely ignores my updated Photos library! Not a single backup of it exists in Time Machine. Also, the Photos library is NOT in the Time Machine exclusions area under "options". Anyone seen this before?!?
iMac 21.5", macOS 10.13