Ah yes you're right. I was thinking about the OCBF tension-only exception which i've used for tension-only in SDC D projects. I.e., rod bracing for 'small' structures where R=3 isnt permitted.
But back to your question: I've never actually designed a single-tier x-brace SCBF. Only two-tier module types, where the 'x' occurs at an intermediate floor beam. The floor beam provides lateral stability at the connection. That said, if you look at 341-16 fig C-F2.15 it appears to show that this configuration is permitted, or at least addressed in regards to protected zones. Other than that, I can't find anything in the code that specifically addresses what you're asking. So we're back to square one.
I've got some details in my 'library' for SCBF connections at the X-intersection but I can't back them with any references.
So, two thoughts - spitball style:
1) Design the x-intersection gusset to develop the full compressive strength of the brace plus whatever material overstrength. I'd imagine it'd be a pretty thick plate and brace reinforcing.
2) Dig up some reference that lets you say the tension brace 'braces' the compression brace at the intersection and detail the gusset like you would the other gussets...
Interested to see if anyone else has input.