Just tried both the Reprieve Potion and Arcane Synergy and neither triggered the behavior - blade was still giving 3d8 after.
However: The ring's blade I could still drop on the ground at will:
![[Linked Image from i.ibb.co]](https://i.ibb.co/SD9MPqFQ/bg3-shadow-blade.jpg)
Something that definitely doesn't work with the memorized version of the spell.