No longer able to create applications with API keys

A few days back I was able to create new applications in V3 using an API. Now, using the same API key, I only get the following error (403):

   "message":"error:pkg/auth/rights:no_application_rights (no rights for application `my-app@ttn`)",
         "message_format":"no rights for application `{uid}`",

What has changed?

As you know when “a few days back” is/was, you can use that to look at the release history of the stack on GitHub to see “what has changed”.

The exact date was: Apr 16, 2021 16:26:35

I already checked: Release Notes | The Things Stack for LoRaWAN (which don’t have dates unfortunately). But couldn’t find anything that sticks out.

I now checked here: Releases · TheThingsNetwork/lorawan-stack · GitHub

For the date mentioned, that would mean versions 3.12.2 and 3.12.3 … which also doesn’t highlight anything on this regard.