Firefox and Chromium from snaps unusable due to graphical glitches

After upgrading Ubuntu to 23.04, I can no longer use Firefox nor Chromium provided as snaps.

First, this is how Chromium looks like:

glitchy Chromium ran from snap package

Firefox from snap behaves the same way. The problem is present in GNOME 44 both under Wayland and Xorg.

Firefox installed from mozillateam's PPA works absolutely without any issues. (I am typing this post from that version.)

Here's the output from running glxinfo -B:

name of display: :0
display: :0  screen: 0
direct rendering: Yes
Extended renderer info (GLX_MESA_query_renderer):
    Vendor: AMD (0x1002)
    Device: AMD Radeon RX 5500 XT (navi14, LLVM 15.0.7, DRM 3.49, 6.2.0-1003-lowlatency) (0x7340)
    Version: 23.0.2
    Accelerated: yes
    Video memory: 8192MB
    Unified memory: no
    Preferred profile: core (0x1)
    Max core profile version: 4.6
    Max compat profile version: 4.6
    Max GLES1 profile version: 1.1
    Max GLES[23] profile version: 3.2
Memory info (GL_ATI_meminfo):
    VBO free memory - total: 7509 MB, largest block: 7509 MB
    VBO free aux. memory - total: 7886 MB, largest block: 7886 MB
    Texture free memory - total: 7509 MB, largest block: 7509 MB
    Texture free aux. memory - total: 7886 MB, largest block: 7886 MB
    Renderbuffer free memory - total: 7509 MB, largest block: 7509 MB
    Renderbuffer free aux. memory - total: 7886 MB, largest block: 7886 MB
Memory info (GL_NVX_gpu_memory_info):
    Dedicated video memory: 8192 MB
    Total available memory: 16183 MB
    Currently available dedicated video memory: 7509 MB
OpenGL vendor string: AMD
OpenGL renderer string: AMD Radeon RX 5500 XT (navi14, LLVM 15.0.7, DRM 3.49, 6.2.0-1003-lowlatency)
OpenGL core profile version string: 4.6 (Core Profile) Mesa 23.0.2
OpenGL core profile shading language version string: 4.60
OpenGL core profile context flags: (none)
OpenGL core profile profile mask: core profile

OpenGL version string: 4.6 (Compatibility Profile) Mesa 23.0.2
OpenGL shading language version string: 4.60
OpenGL context flags: (none)
OpenGL profile mask: compatibility profile

OpenGL ES profile version string: OpenGL ES 3.2 Mesa 23.0.2
OpenGL ES profile shading language version string: OpenGL ES GLSL ES 3.20

One additional detail that may or may not be relevant is that because my motherboard is old, it can't boot with the above card. For that reason, I also have an ancient nVidia Geforce 210 plugged in and blacklisted in /etc/modprobe.d/blacklist.conf. That ensures the machine starts, and after that the nvidia isn't used in any capacity.

I have no issues running any other applications, including games, both native and under Proton/WINE. No other snap application presents these glitches either (tested by running the newest version of Blender).

Any clues how to troubleshoot the issue?