Many wishes for health and good luck to you and your family.

Try this. https://github.com/GrapheneOS/os-issue-tracker/issues/5033#issuecomment-2754800106

Try something like this : turn off night light. Reboot phone, turn on and see if this will work. I had an issue with automatic white-dark themes and followed this workaround. Not sure if this is the correct order and j don't have the specific forum thread I've read it from, but look for similar. If I recall correctly I read it in a GitHub nkw closed issue from Grapheneos.

https://www.youtube.com/watch?v=8M5Nzb8sJWg