With Season Two Update 17718, the Meinwerk Palace was set to reduce technology COST by 40%, and also increase research SPEED by 40% (which matches the current in-game description in update 6.0.878). However, it is currently only increasing research SPEED by 30%.
For example, the default research time for the Bloomery technology at a regular Blacksmith is 60 seconds, and at the Meinwerk Palace, it is 42 seconds. At a 40% research speed increase, the reseach time should be 36 seconds (60*0.6 = 36).
All technologies available at the landmark have the same error only receiving a 30% SPEED increase instead of the intended 40%. However, note that the 40% reduction in COST is working as intended.
Also, the new Steel Barding technology (update 6.0.878) has a 64 second research time. I don’t know if this is intentional or if it’s supposed to have a 36 second research time just like ever other technology at the building (including the newly added Riveted Chain Mail technology; accounting for the corrent 40% reduction in research speed).
When using the Meinwerk Palace to get all the upgrades as quickly as possible for a timing push, this 30% vs 40% buff can really make a difference. There has been many attempts to buff the Meinwerk Palace to make it a more competitive option to the Aachen Chapel (including with the new techs in update 6.0.878), however, this error is preventing the landmark from being used as intended.