I have a dev pro sandbox I use. Source Tracking was not enabled, so I enabled it in the prod org.
I read that new and refreshed dev and dev pro sandboxes will now have Source Tracking enabled.
So, I refreshed an unused dev pro sandbox with my sandbox, and then refreshed my sandbox with that other sandbox.
Still, when I execute sfdx force:source:push, I get a message telling me that only works on orgs which have source tracking enabled. (BTW, I did reload my VS Code window.)
Why is Source Tracking not yet enabled in my sandbox?