Sun Jul 15 2018 19:51:24 UTC
If an infinite amount of monkeys were to write code, one would make the same mistake like you did.
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ID Product Comp Assignee Status Resolution Summary Changed
39507 Xamarin. Runtime bugzilla CONF --- Hard crash when overriding HasKeyEquivalentForEvent in NSMenuDelegate 2016-09-26
53962 Xamarin. Runtime bugzilla REOP --- Setting return as a Key Equivalent for NSButton on Interface Builder does not produce desired result 2017-04-25
3 bugs found.

as

File a new bug in the "Runtime" component of the "Xamarin.Mac" product