OAuth 1 flow broke with latest Cloud deployment


with the latest deployment, from a bit ago (worked earlier today?), after logging in with the OAuth 1 flow, the following comes up (only happens if you are not logged in yet. When logged in, it does not come up):

The URL is: https://yasoon.atlassian.net/getstarted/undefined/gateway/api/user-seg-redirector/v1/redirect/unsupported

Logged in, it looks like this (correct)

Any idea?