flow-development-collection: Authentication Redirect with subfolder fails

Description

instead of redirecting to /t/package/authentication/index flow 4.3.18+ redirects to ``/t/t/package/authentication/index`

Steps to Reproduce

1. flow in subfolder (symlink)
2. enable rewrite

Expected behavior

same as 4.3.17 redirect to the correct auth endpoint

Actual behavior

s.a.

Affected Versions

Flow:

• atleast 4.3.18 - 4.3.21