I attempted to cast a quandrix command in response to my opponents unburial rights. My spell went on to the stack, but my mana was never tapped. The spell was removed from my hand and was not placed in my graveyard. My opponent was able to resolve their spells and take game actions, despite my card being on the stack (and it would have removed legal targets for the unburial rights they resolved). Basically my card just disappeared and I wasn't able to use it. Attached screenshot shows the issue as Faithless Looting should not be on the stack above my spell. This happened on the PC version of Arena.
I attempted to cast a quandrix command in response to my opponents unburial rights. My spell went on to the stack, but my mana was never tapped. The spell was removed from my hand and was not placed in my graveyard. My opponent was able to resolve their spells and take game actions, despite my card being on the stack (and it would have removed legal targets for the unburial rights they resolved). Basically my card just disappeared and I wasn't able to use it. Attached screenshot shows the issue as Faithless Looting should not be on the stack above my spell. This happened on the PC version of Arena.