Exactly the same issue at my end.
I’m using Elementor Pro + Astra Pro + WP Reset
The <span class=”post-state”> tags inserting the text displayed after my astra theme update from 2.5.5 to 2.6.
I rolled back to 2.5.5 and the span tags are gone.
It’s worth noting that I had this issue using the free version of slate theme a couple of months back, I upgraded to pro and that seemed to fix the issue.
Now the issue is displaying using the pro version too! Although rolling back astra seems to have worked for now. Will update all if I find a definitive solution.