Combining Bold, Italic and strikethrough formats can generate invalid markdown

Lexical version: 0.2.9

Steps To Reproduce

1. Enable Bold, type (Bold )
2. Enable Italic, type (Italic )
3. Enable strike through, type (bold italic strikethrough)
4. View generated markdown

Note that the generated markdown is:

**bold *italic ~~strikethrough***~~

Which escapes strikethrough incorrectly, it should be

**bold *italic ~~strikethrough~~***

The current behavior

Invalid markdown is generated

The expected behavior

Proper markdown should be generated

Current bad state

Fixed state with open PR: