How can I set the "?next" url for a flow?

[linkandzelda91]

I ran into the same problem as this guy:
#9965
in the comments someone suggested this:

I'm not saying that I dont agree with your point, this was just for context of why the current behaviour happens as it does.

I think this might be also fixable by ensuring the correct ?next url is set for all those flows, as in that case the redirect from authz flow -> cancel -> invalidation -> authentication should keep the correct final next parameter, which would also solve this issue, and wouldn't require us to decide which flow plan items should be deleted and which shouldn't

I can't figure out how to do this, and neither can the other people commenting on the issue.

I think this page might be related, but kind of stumbling around not making progress at this point.
https://docs.goauthentik.io/docs/add-secure-apps/flows-stages/flow/context