Thank you for your reply.
I think I have solved this problem because the properties “mix-blend-mode” and "lightbox", they conflict.
Happy New Year!
When I upgraded to 2.7, all the previous project link and next project link didn't work.
and ".type-project" code is invalid.
Because I am reverting to the previous version, I am unable to provide a link to the bug website.
I can't find Misc option, I really need it.
I don't know why I don't have misc option.
Now is there any way to make "next project link" goes to the next project of the same category, even if the project has multiple categories?