This is a poor answer but here is a quote from an MS Edge developer from the link in the comment
In IE11 and Edge, we made the decision to ignore autocomplete=off
From here
This was done, it seems:
to provide increased user value.
My solution is to select the form field and clear it using javascript on a reload. E.g.:
document.querySelector("#theInput")
.addEventListener("load", function (event) { event.target.value = "" } )
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