When editing the LINK head or tail, there is an exception in Chinese input

[cai123nb]

📝 Provide detailed reproduction steps (if any)

1. go to https://ckeditor.com/ckeditor-5/demo/#balloon
2. scroll to LINK section
3. edit link tail in Chinese

✔️ Expected result

It should generate Chinese word instead of English alphabets. Just like edit in the middle(It's quite right).

❌ Actual result

It record many useless English alphabets.(It should work like edit in the Link middle).

📃 Other details

I record some gif files to demonstrate this bug, hope it can help.

edit in middle(right):

edit in tail(wrong):

• Browser: Chrome
• OS: Mac OS
• CKEditor version: See demo.
• Installed CKEditor plugins: See dmo.

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[Mgsy]

Hi, thanks for the report. We're aware that composition breaks in many cases. This one is also known - you can read more about it here - #3118.