Address further review of unregistered type handler #10776
Merged
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Description
This PR follows up on post-merge review comments for #8274 (added unregistered type handler).
#8274 (comment)
#8274 (comment)
How has this been tested?
Ran automated tests. Manually tested by changing and saving content around unregistered blocks, re-enabling a plugin that registers the missing blocks, and reloading to observe that the content was preserved.