Web panel content is not visible after navigating to issue and expanding it

Created from this Developer's Community issue -  - https://community.developer.atlassian.com/t/webpanel-not-visible-after-expanding-it-in-issue-right-context-old-issue-view/39479/3

Steps to reproduce
90% reproducible with simple atlassian-connect.json and index.html (see below).
Disable “New Jira issue view” in personal settings and follow the steps:

1. Say we have a field Text Right Content,  collapse “Text Right Content” clicking it to get “> Text Right Content”
2. Press F5 to refresh the page
3. Expand “Text Right Content” clicking it to get “\/ Text Right Content”
4. “Text value” is not visible.