I can confirm I am having the same experience you are having. I have my tdarr_temp folder set to prefer cache (NVME) and have not experienced the mnt/user share issue. I went with this approach because I didn't want unnecessary writes to my spinning drives. I've been running tdarr for months now.
[6.8.3] shfs error results in lost /mnt/user
in Stable Releases
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I can confirm I am having the same experience you are having. I have my tdarr_temp folder set to prefer cache (NVME) and have not experienced the mnt/user share issue. I went with this approach because I didn't want unnecessary writes to my spinning drives. I've been running tdarr for months now.