[elmirage001]

That helps narrow it a lot. Thanks Steve!

I can confirm it's the <script type="application/ld+json"> changing to <script type="text/javascript"> that is the problem. I copied the entire view source code from the browser and pasted it into the code area on Google Structured Data Testing Tool. I then changed <script type="text/javascript"> back to <script type="application/ld+json"> and the Google testing tool finds and verifies it. I tested with the structured markup data pasted at the end of the article text while editing the static page.

I'll report back if I can fix why it's changing in the first place.

Paul