Why is E + flash on Jayce not a thing?

Seriously. Yesterday I loaded Jayce game after like a year and when I tried to do E (hammer stance) + flash it doesn't work like with Lee Sin's R or Vayne's E. I don't know why is this not a thing. The target flies in the way I flash instead of the opposite. This needs to be implemented because I don't get why Jayce shouldn't have this mechanic but other champions should.
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