I can confirm that I am seeing the DLNA leak on Version 1.32.0.6973. This is on the official Plex docker container in Unraid (1.32.0.6973-a787c5a8e). It got up to 13-14GB on my machine as well.
Thanks for the response, it got me to realize I had other options. For anyone else in my situation, I found that minidlna was really effective with low RAM usage.