Graphical artefacts when clicking on 'Main Menu' in GNOME 47 application (corrected by GSK_RENDERER=gl)

Hello,

Clicking on 'Main Menu' in a GNOME 47 (Flatpak) application results in graphical artefacts (e.g. flickering and resizing) in the 'pop-up' menu.

Forcing GSK_RENDERER=gl corrects the behaviour.

Steps to reproduce

1. Open GNOME 47 application (tested with Amberol and Ptyxis)
2. Click on 'Main Menu' hamburger

Current behaviour

Graphical artefacts in 'pop-up' menu (e.g. flickering and resizing)

Expected outcome

No graphical artefacts (as with GSK_RENDERER=gl)

Version information

Amberol 2024.1 or Ptyxis 47 (GNOME 47 Flatpak runtime) running on Debian 12.7; GNOME 43.9; Flatpak 1.14.10

# lspci -v
...
02:00.0 VGA compatible controller: NVIDIA Corporation C79 [GeForce 9400M] (rev b1) (prog-if 00 [VGA controller])
	Subsystem: Apple Inc. C79 [GeForce 9400M]
	Flags: bus master, fast devsel, latency 0, IRQ 28
	Memory at d2000000 (32-bit, non-prefetchable) [size=16M]
	Memory at c0000000 (64-bit, prefetchable) [size=256M]
	Memory at d0000000 (64-bit, prefetchable) [size=32M]
	I/O ports at 1000 [size=128]
	Expansion ROM at d3000000 [disabled] [size=128K]
	Capabilities: [60] Power Management version 2
	Capabilities: [68] MSI: Enable+ Count=1/1 Maskable- 64bit+
	Kernel driver in use: nouveau
	Kernel modules: nouveau
...

Additional information

Screencast showing, first, default behaviour of Amberol with graphical artefacts, followed by second run with GSK_RENDERER=gl without graphical artefacts:

Screencast_from_2024-09-22_12-36-54

n.b. Updated title and description to reflect impact on multiple GNOME 47 applications.