Hi @radjr,
Can someone at OJS confirm this please and explain why the change from 2.4.x?
A lot of things got rewritten from 2.x to 3.x, and this was probably an inadvertent change.
At a glance, you should be able to get more details to display by changing {$subscriptionType->getLocalizedName()|escape} to {$subscriptionType->getSummaryString()|escape} in templates/frontend/pages/purchaseInstitutionalSubscription.tpl. If you can confirm that, I can get it included for the next release.
Regards,
Alec Smecher
Public Knowledge Project Team