For everyone, this is Grammarly's response from their support as well. I did note that I am using a Mac though
Thank you for waiting this out!
I can confirm that Grammarly for Windows doesn't currently support Photomechanic. I have reported this issue to our engineering team. The team has identified it as a bug, and while there’s no immediate solution, you can rest assured that our engineers plan to fix it in the future.
Although there’s no quick resolution now, we will keep gathering information about the issue and prioritizing it accordingly.
We don't think it's right to set any expectations at this moment. That said, please feel free to reach out regarding this issue again at any time.