Unsure what could have changed just recently… everything is suddenly working for the systems that we had issues with.
I re-applied the 13.14.4 kernel, and everything started functioning. I’ve tried to update the kernel with different versions that we had been trying, but they all seem to be working now as well. Maybe there was just a problem with the kernel when it was downloaded. At any rate, the issues seems to have gone away. If I run into this again, I’ll try to post what kernel we have installed and all relevant configuration information.