I exported an XML of a 25fps timeline but it did show 50fps at the grade house.

I have the same issue. Noticed it right after upgradeing to new 2025 Premiere

As a colorist I have this problem with two different projects, I check and if you put the timeline at 24fps it exports properly, but when you put timeline at 25fps it exports at 50fps. Also when you import back the xml it brokes, and you need to upgrade to beta to being able to do it. Terrible