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Edit of headline caused URL to break?

After posting this question I sent the corresponding URL via email to somebody. In the meantime a user has edited the headline of my question which rendered my old link invalid. I used the URL in my webbrowser which was https://math.stackexchange.com/questions/3225a642/g-is-an-abelian-group-and-a-permutation-t-suppose-that-x-tx-neq-y-ty/3225753

As a result the person I sent it to had no chance to read the post.

A solution would be to still accept the old url after the edit.