I did a fresh Tumbleweed 20260304 installation 2 days ago, then added TDE. Starting session opened Trinity help center with subject error window reporting:
X 'tdelauncher said: Unknown protocol".'
Help Center window opened, but the right side pane was empty. I didn't close the Help Center, and this failure repeated anew on every session start until I did close the popup and the Help Center window before opening the Help Center anew.