[boot scriptor] key press repeated on floppy boot

I have this line in a script:

if ($lastKey == key[f3]); then boot $fda

and when I press F3 the floppy boots fine, but it acts as if I had pressed
F3 again after I booted to the floppy.  In this particular floppy F3 is
the key to rename a mennu entry, so as soon as the floppy boots I am
presented with a prompt to rename, even though I only hit F3 one time
total and that was to boot the floppy.  Is there a way to get around this?
 Am I doing something wrong, because this doesn't seem like desired
behavior?

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