Mordekaiser ghost not working with Zeke's Convergence

So made a post on it before. https://boards.na.leagueoflegends.com/en/c/gameplay-balance/F7KofNWY-zekes-convergence-not-working-on-mordekaiser

After more testing I've found that Shaco clone actually works with Zeke's Convergence. However the additional magic damage doesn't apply to test dummies and it the "ignite froststorm" mechanic doesn't work at all.

So I'm unsure about the frost storm mechanic not working, that is pretty lame. I am guessing that you need to do physical damage in order for the burn to apply. I don't think there's any other champions that I can test it on so feelsbadman :C