Slice B.6 / S6 renamed the canonical edit URL from /admin/rules/{id}/edit
to /admin/procedural-events/{id}/edit. The backend handler + 301 redirect
landed, but the client-side regex in admin-rules-edit.ts:110 was missed —
it still only matches the legacy /admin/rules/.../edit shape. Result:
visiting the canonical URL from the list page shows 'Ungültige
Verfahrensschritt-ID in der URL.' even though the rule exists.
Fix: regex accepts both '/admin/procedural-events/{id}/edit' (canonical)
and '/admin/rules/{id}/edit' (legacy, kept for stale tabs / bookmarks
during the deprecation window).
m flagged 2026-05-27 17:57 on rule cc439590 (RoP.262.2, upc.inf.cfi).