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Report an error when the component event name is once #8342

Description

@baiwusanyu-c

Vue version

latest

Link to minimal reproduction

https://play.vuejs.org/#eNqFUM1KxDAQfpUhCG1BNvealhXxJLiggpdcajorwTQJybQiy767ky3Kspe95Zt8fzMHcR/jZplRtEJlk2wkyEhzBDf4z04Lylr02tsphkTwEKYI+xQmqDaygCKttDfBZ4LgDUIHdQNdD4PDRLUWZahFc6e9kmsA2zEgnKIbCBkBqOJVHgDbIuDgVbfOJJOUPFMwzPTjELIJEceerQvkH3Er/npdWWnEvfX4OFnK6lByamzhv28LS7Ajtz729bXyo13AuCFnNv9OQ4yYTgmluvqYiYKHrXHWfDHhBjmxrkpM1TDtdLTn3Ru8716eXpVc+auxZOfL1cXxF12okng=

Steps to reproduce

open the link

What is expected?

no error

What is actually happening?

get error:
Cannot read properties of undefined (reading 'toLowerCase')

System Info

No response

Any additional comments?

Issue exposed by #8334 and doesn't seem to be fixed by #8338

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