I've become very sensitive to styles and themes to keep things as light as possible. I always save any styling of an object to a style (and then to the theme).
When you copy/paste an object (in this case, text), the style is intact. Upon changing the text itself (i.e. changing a label by typing from Class to Teacher) you now see the lovely red triangle next to the style name and accompanying asterisk (*). Of course before I discovered this, I would work, periodically check to make sure I had no localCSS, and I would see this. Then time is spent hunting for the issue among dozens (at least) of objects on the layout.
Example of automatic style added after changing text:
I simply click "Revert Changes to Style" from the Inspector and that addresses the issue.
I checked the style color in the theme and it's exactly the same as the added localCSS:
Reapply the style to the object
Thanks in advance for the feedback or confirmation.