While I have not upgraded to 5.3.0-59, I upgraded to 5.4.0-37, as the
5.4.0 kernel has finally been made available in 18.04. This version and
possibly later fixed the issue I originally had.

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https://bugs.launchpad.net/bugs/1880041

Title:
  Failing to shutdown/power off or reboot on AMD Ryzen CPUs on kernel
  versions 5.3.0-52 and later

Status in DRI:
  Unknown
Status in linux package in Ubuntu:
  Fix Released
Status in linux-meta-hwe package in Ubuntu:
  Fix Released

Bug description:
  When booting up Ubuntu 18.04 with a kernel version of 5.3.0-52 or
  later (including 5.3.0-53), everything seems to be working as usual.
  However, when I shutdown, the system will only soft shutdown, with the
  CPU still running at full power, forcing me to hold down the power
  button to fully power off affected systems. If I reboot, it will cause
  the system to hang and not respond. Either way, a hard reset or
  poweroff will be required, and this is not an option for systems being
  remotely accessed. It is not possible for me to collect kernel logs at
  this point, unless something wrong is happening in those kernel
  versions before the actual shutdown.

  It is possible that this may also occur on Ubuntu 20.04 with kernel
  versions 5.4.0-29 and later, but I have not yet tested this out. This
  problem is occurring on both my desktop and laptop computers which
  respectively are:

  * AsRock B450 Pro4 with AMD Ryzen 3 3200G APU
  * Lenovo ThinkPad A485 with AMD Ryzen 5 Pro 2500U mobile APU

  In the meantime, I am stuck on kernel version 5.3.0-51, as that is the
  last working 5.3.x kernel version offered in the standard Ubuntu
  repositories that doesn't have this problem, without me having to use
  PPAs. I don't know if this problem also occurs on systems with Intel
  CPUs, as I don't own any recently-made system (last 3 years from 2017)
  with such CPUs to test if this problem occurs on them.

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