Some objects not making it into the UUID index?

We had a missing image in one of our stories and I just spent a few hours dealing with a UUID I just couldn't find in the index, no matter how hard I tried:

>>> story =['indonesia-death-07092020180018.html']
>>> image = story['indonesia-death.jpg']
>>> from plone.uuid.interfaces import IUUID
>>> uuid = IUUID(image, None)
>>> uuid

ok.... then....

>>> from import uuidToObject
>>> obj = uuidToObject(uuid)
>>> obj


>>> from Products.CMFCore.utils import getToolByName
>>> catalog = getToolByName(app.RFA, 'portal_catalog')
>>> catalog.unrestrictedSearchResults(UID=uuid)


I cleared and reindexed the UUID index and this specific case was resolved, but I'm noticing that my Path Index has 83973 values, but the UUID index has 80058 values. That seems a bit suspicious to me. I expect I'll be revisiting a bug where another UUID lookup is failing.

What am I doing wrong?
Should I be suspicious?
Anyone else seeing something like this?
Where can I debug deeper? Like raise a pdb if the indexer fails to put an object's UID into the UID index? I want to investigate this further.

You need to be careful with the interpretation of the term "index value": the number of index values is typically not the number of indexed documents. The "values" for a PathIndex are for example not paths but id components in those paths.

Be sure that is enabled

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