Bug: input Chinese character after mention break mention entity and repeat characters

[franckchen]

Lexical version:

Steps To Reproduce

1.https://playground.lexical.dev/ 2.type @ to call mention 3. mention anyone 4. input Chinese character 5. Input of Chinese characters has corrupted the entity, and repeated characters have appeared.

https://github.com/facebook/lexical/assets/5096940/b2715103-499f-41f1-a353-b3d8a183d33e

Link to code example:

The current behavior

The expected behavior