@G_W_Albrecht and @S_E_
We have 2 post on the same topic so I will copy my answer
first I will start and say that we are working to fix the specific bug search and sk number search in usercenter and it should be sorted by tomorrow morning.
regarding why we did such change:
This method brings a modern UI with better browsing capabilities and user experience.
We are in the process of upgrading our systems to improve the overall customer experience, a better search engine and results.
As Jumbo SKs are part of a fundamental process we decided to go ahead and start with the Jumbos.
Browsing through hundreds or more items became cumbersome and the new format makes it much easier.