I am not sure this is correct so I added my comment into 1864188.
To increase chances that somebody sees it, the comment says that, on my system, the iwlwifi driver shipped with the standard bionic kernel 5.3.0-46 seems to be loading the wrong firmware blob. It loads "iwlwifi-Qu-b0-jf-b0-48.ucode" which crashes quickly, as seen in dmesg. I believe it should load "iwlwifi-QuZ-a0-jf-b0-48.ucode". I now use a driver that does so and all is working fine.
Bug 1864188 is marked as a duplicate of this one.
I am not sure this is correct so I added my comment into 1864188.
To increase chances that somebody sees it, the comment says that, on my system, the iwlwifi driver shipped with the standard bionic kernel 5.3.0-46 seems to be loading the wrong firmware blob. It loads "iwlwifi- Qu-b0-jf- b0-48.ucode" which crashes quickly, as seen in dmesg. I believe it should load "iwlwifi- QuZ-a0- jf-b0-48. ucode". I now use a driver that does so and all is working fine.