Thanks for your help but bulk edit did not fix it.
However, I found a workaround! The issue seems to be related to valid but not “pretty” HTML in the Description that was somehow altered to pre formated code
<h3>Product Overview</h3>
<ul>
was altered into :
<pre><code> <h3>Product Overview</h3>
<ul>
</code></pre>
And for some reason this confused the editor/publication to the previously described symptom.
I.M.H.O. HTML should be treated as “raw” on import and/or in the editor.
I’ve now made sure there are no cache plugins installed. I’ve deleted the /wp-content/cache folder and followed your instructions. Client cache is not used while testing.
Problem remains.