Hermit yoda wins solo?

Hermit Yoda escapes if there are no surviving allies, so it's a win. The fact that he's not shown to escape here must be a visual bug. There used to be a bug related to (pre-rework) Palatine's bonus damage and expose or deathmark where an enemy would go to 0 health and still be standing, but the victory screen would still come up. This seems similar.

If you'd like to report it on Answers HQ, you can:

https://answers.ea.com/t5/Bug-Reports/bd-p/star-wars-galaxy-of-heroes-bug-report-en