App peek not working

Version: 0.9.0 (build: 42)

Device model: BRAVIA 4K UR2

Device RAM: 2301 MB

While having 'App peek' enabled, it does not actually show up when 'hovering' over a favourited app on the home screen. This happens on all graphics presets. Perhaps it is related to available device RAM. However, the app is still available in the background and selecting the app instantly puts it back in the state where it was before.

Current behaviour

Hovering over a favourite app does not have any effect other than darkening the screen (when 'Immersive mode' is disabled.

Expected behaviour

Hovering over a favourite app blurs the background (when 'Immersive mode' is disabled) and the app shows in a flyout/popover.

Bonus: 'Immersive mode' can be enabled in the menu, even if 'App peek' is disabled.