This bug report is about Android's upcoming predictive back gesture: https://developer.android.com/guide/navigation/predictive-back-gesture.

Expected

Executing the predictive back gesture on supported apps triggers a pleasant animation and smoothly animates from the app to the home screen.

Actual

Executing the predictive back gesture on supported apps does not trigger the animation, neither on stable Android 13 nor in the latest Android 13 Beta. In the latest Android 13 Beta (T2B1.221118.006), there's also a noticeable delay before the home screen appears, and tapping on the home pill at the bottom instantly opens the just-closed app (see attached video).

Steps to reproduce

• Install a third-party launcher
• Set the third-party launcher as default
• In Android's System settings, enable gesture navigation
• In Android's developer options, enable "Predictive back animations"
• Open an activity that supports predictive back gestures (e.g. Android's app info settings screen for an arbitrary app)
• Swipe from the left or right edge of the screen to trigger the back gesture

Attachments

• Bug report: https://drive.google.com/file/d/180y4F66_8g2jPkDw0-kMB6ewCOk-P9MA/view?usp=sharing
• Video demonstrating the issue: https://drive.google.com/file/d/12q6y5awce8mDjrXLtG1rPVcQHZH-BY5k/view?usp=sharing. The first part shows working back animation with the preinstalled launcher (Pixel Launcher), second part shows bugged animation with a third-party launcher (Niagara Launcher).

Device info

Tested on Pixel 5 Android 12 T2B1.221118.006. This seems to be a Framework Launcher3/Quickstep/SystemUI issue.