Inbefore: I'm still on 2.4 but haven't seen this under fixes yet. Will take a look and report it for 2.5 when I'm upgrading.
Very minor and purley visual bug, I think:
If you have ground forces in training with only 50% it estimates the time needed for training wrong. It seems that it does not / through 0.5 but instead * by 0.5 for the build time in the queue:
Eg.: Two exactly the same formations in training. 7th blabla has 50% allocated, 4th blabla has 100%. One would expect that the 7th blabla needs twice the time for training(which it actually does when it's being build). However, in the queue it shows 0.09 (= 0.17 * 0.5) years as the expected build time.
The actual training time is unaffected, as one can see in the screenshot: It's december 2672 and the 5th blabla will be finished in April 2673, which is roughly four months/third a year (0.17 / 0.5 = 0.34 years).