Key mapping behaves differently than same sequence of keys struck by hand

As a keystroke sequence
hEa"<Esc>Bi"<Esc>j
seems to enquote the current word anywhere in the line.
In particular, it does so if the cursor is in column 1 at the start of
the first word.

But as a key mapping, e.g.
:map <F5> hEa"<Esc>Bi"<Esc>j
it fails if the cursor is in column 1

Why the difference?

--
Graham Lawrence

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