Unless I understand it incorrectly, rules state that if a ship A is between 20% and 25% larger than ship B then only 1 way refit should be possible - from ship A to ship B (as the change is less than 20% of it's current size). I. e. you can refit from 2538 tons to 2061 tons, but you cannot refit from 2061 tons to 2538 tones (as it's above 20% change).
Info in the new "Priorities / Misc" screen might be incorrect, as for the bigger ship under "refit from listed class to current class" it list the smaller ship, and for the smaller ship it doesn't list anything.
Instead for the bigger ship it should list the small ship under "refit from current class to listed class", and for the smaller ship it should list the bigger ship under "refit from listed class to current class".
Attaching some screenshots that show this problem.