REGRESSION: Yes. Does not occur in 4.16.3
Using Copy/Paste to duplicate a component will result in a broken duplicate component. This doesn't occur if the user uses Ctrl+W to duplicate.
On compile, the user will either crash (see callstack), or generate a compile error:
Duplicate component has odd name, and either the blueprint will error on compile, or crash.
There's no existing public thread on this issue, so head over to Questions & Answers just mention UE-47834 in the post.