Extending the editor duplicates instead of update during Edit post/thread

Extending the editor following the steps outlined in the Extending the Content Editor documentation renders a duplicate instead of replacing/updating the existing code-block when we're editing a blog post or forum thread. This is the case with both of the two extensions we've applied to our editor.

We see no issues in the code/implementation and are wondering if we're the first to bring this up or is a known issue?

Edit Blog Post or Forum Thread

1. Click Edit

2. Make changes:

3. Result is a duplication instead of an update:

Version: 10.3.1.7330
OS: Windows 10
Browser: All latest (Edge/Chrome/Firefox)

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