bug: "grown up" is the correct phrase "who's grown up" doubly wrongly flagged.

[hippietrail]

Describe the bug

1. In the sentence "As an American who's grown up in America." "grown up" is flagged to join in "grownup" even though that it would change it from a grammatical sentence into an ungrammatical one.
2. The message is The possessive noun implies ownership of the closed compound noun “grownup”. which is totally wrong:

• There is no possessive noun in the sentence. A possessive noun would be a noun followed by -'s
• "who" is not a noun but a pronoun, a relative pronoun in this case
• "who's" is not a noun or a pronoun, and is not a possessive. It's a contraction of "who" and "has"
  ("who's" can also be a contraction of "who" and "is" in other contexts.)
• The possessive of "who" is "whose".

To Reproduce
Steps to reproduce the behavior:

1. Paste in "As an American who's grown up in America"
2. See how many problems you can count.

Expected behavior
Nothing wrong to flag in this phrase.

Screenshots

Platform
VS Code, Windsurf