Template insert error: bad outliner data, need to re-index to fix

I’ve only been using Logseq for a few days and getting to grips with templates. I have created a meeting template but whilst editing the template and testing it, I get a ‘Template insert error: bad outliner data, need to re-index to fix’. It isn’t 100% repeatable, but happening multiple times.

When I did a reindex, I lost a number of blocks on my daily journal page. Will look at GIT for versioning next. Template is:

- ### <% now %> TITLE
  event:: [[meeting]]
  project::
  template:: Meeting
  template-including-parent:: true
	- **Attendees:** [[MY NAME]],
	- #### Notes: