Meta Description not getting published

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RapidWeaver Version: Version 7.0.2 (17812)
System Version: 10.11.4
Hardware: iMac with all the bells and whistles

We add the meta description in Inspector/Meta Tags/ Description Box.

When we preview in Firefox the meta description tag shows up in source code.

After we export (publish), the meta description is not showing up in the source code.

Is this a bug or are we not inserting the meta description correctly?

We tried the old way by clicking on the + button and typing in description with the description, also not showing up after publishing.

We are using Sitemap plugin

Expected Result:
When we insert meta description it should show up in source code.

Additional Links:
(If you have any projects files, screenshots or videos of the bug in action please link to them here.)