Jon Worth exclusive! 25% off Paris - Berlin train tickets! (Really, sort of)

On 25th June I need to travel from France to Berlin. One option is to take the once daily direct train from Paris Est to Berlin Hbf. Here's the timetable and the price of that train from SNCF:And here is the same connection on the same day from DB:The connection as shown by DB is 77 minutes longer than shown by SNCF.And that connection on SNCF's website is bookable now.So what's going on?There are engineering works somewhere between Bad Hersfeld and Erfurt, and so the train will be diverted. DB has the diversion planned in already, and SNCF does not.You can see the timetables are only different between Frankfurt and Berlin - SNCF version on the left, DB version on the right:Due to the works being in Germany, I presume the DB times are correct and the SNCF ones have not been updated yet.So what about the 25% reduction then?If, today (and all the data is correct today, 24 May) you booked this train on SNCF Connect, SNCF is then going to tell you at some point between now and your…