E2E "vanished" after upgrade


I upgraded from 0.71.1 to 0.72.3 and the E2E-option is still shown in the admin-menu but encrypted chats are, well…encrypted and the users are missing the encryption-options.
Encryption is enabled according to the Admin-preferences and I disabled and re-enabled E2E but still nothing.
The only additional thing I see in the Admin-area is an “E2E_Enable_alert”.

Any ideas?