Black squares in Skype Ubuntu 20.04 LTS

Screen ExampleCan anyone explain the attached image? Only happens in Skype. Used to occur in Chromium until I turned off hardware acceleration in Chromium settings. All packages and snaps are up-to-date. Info from system:

 $ glxinfo | grep render
direct rendering: Yes GLX_MESA_multithread_makecurrent, GLX_MESA_query_renderer, GLX_MESA_query_renderer, GLX_MESA_swap_control, GLX_OML_swap_method,
Extended renderer info (GLX_MESA_query_renderer):
OpenGL renderer string: ATI RV370 GL_NV_blend_square, GL_NV_conditional_render, GL_NV_copy_image, GL_KHR_texture_compression_astc_sliced_3d, GL_NV_conditional_render, GL_OES_fbo_render_mipmap, GL_OES_get_program_binary, GL_OES_mapbuffer,
$ sudo lshw | grep -A9 VGA description: VGA compatible controller product: RV370 [Radeon X300] vendor: Advanced Micro Devices, Inc. [AMD/ATI] physical id: 0 bus info: pci@0000:01:00.0 version: 00 width: 64 bits clock: 33MHz capabilities: pm pciexpress msi vga_controller bus_master cap_list rom configuration: driver=radeon latency=0
1 Reset to default

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