Pinegrow3 not immediately updating style.css file when edit is done in the style editor which show ALL css codes

Scenario
spec

From the snapshot above. When I click on the shortcut “style” icon and I edit the entire style sheet, rarely pinegrow immediately updates the css file. I tried this about 15 times and I notice updates to the file is being done after about 10 minutes.

However when I edit the individual css selectors (not opening the entire css style editor and edit the selector), I notice the changes are being written to the file immediately.

Has anyone been experiencing this?