FP4 doesn't get offered latest /e/os updates on updater (Stuck on 2.1 beta s testing build)

• /e/ version:2.1-beta-s
• Device model(s): FP4
• Developer mode enabled: yes
• Device rooted: no
• Trackers blocker enabled: yes

Summary

Since May 20th no updates appear on OTA Updater

The problem

when pulling down in the updater, no updates get offered. FP4 should change from s to t build. Activating/Deactivating testing-channel doesn't change anything

What is the current behavior?

What is the expected correct behavior?

Technical informations

Relevant logs (adb logcat)

Relevant screenshots

Solutions

Workaround

tried to adb sideload latest t build, but it won't apply neither (Failed to Find update binary META-INF/com/google/android/update-binary)

Possible fixes