DevonThink and nvAlt - tags issue

I use nvAlt for notes (and add tags). The great majority of notes have tags.

Using version 2.2 (122). These are all saved in one folder (/Users/victor/vwdata/data/notes, that is not in DropBox but a local folder).

In DevonThink (currently 2.9.5). I created a database. I indexed the folder with notes.

DevonThink displays the tags for a small number of the notes. I cannot work the reason why only some notes are displayed with their tags and others are not.

Does DevonThink properly support tags created in nvAlt, and if it does how do I get it to display the tags for all the notes that have them?

The issue is with nvAlt. OpenMeta Tags are deprecated.