Scrivener cannot change the color of font


I am unable to change the font color in one of my projects.
As a comparison, I created a new project and was able to modify the color successfully.

I don’t know how I should troubleshoot the cause, I recorded the operation, could you please help me to see the problem, thanks!

screen recording file link: WeTransfer - Send Large Files & Share Photos Online - Up to 2GB Free

Does it continue to happen if you copy and paste this same text into the blank test project? If so, zipping that test project and posting a sample would help a lot. It is difficult to say what is going on here.

If you prefer, you can send it privately by clicking on my avatar, and then the “message” button.

Thanks for your reply.

I have tried transferring the project and then it went back to normal.
Thanks again.