ACS Commons 6.15.4 – Unable to Edit Pages via editor.html (Old 4.x Functionality Missing)

After upgrading to ACS Commons 6.15.4, ACS Commons pages are no longer editable via editor.html as they were in 4.x (for example, Dispatcher Flush and Adobe League pages now appear read‑only). Is this expected behavior? Do we have any supported workaround to retain the old page‑based editing model, or is using an older ACS Commons version the only option?
https://xxxxxxxxx.dev.xxxxxxx.adobecqms.net/editor.html/etc/acs-commons/dispatcher-flush/test-lts.html