Theme Management Exception Thrown and blew away my site

I made a small update to the HeadScript file in my theme yesterday... the site hung and the next thing you know the majority of my theme files were missing and we were getting the "Well That  Was Unexpected" image showing across our site.  The Administration area was still accessible and luckily  I had a couple-days old backup of the theme export I was able to import and bring our site back online, but I want to understand why a simple save nuked my theme and took down our site.

UnknownError

Theme Management: Could not publish theme Theme Type:0c647246-6735-42f9-875d-c8b991fe739b Theme:3fc3f824-83d1-4ec4-85ef-92e206116d49


Added more context
[edited by: Luke R Davidson at 12:08 PM (GMT 0) on Fri, Feb 12 2021]
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