HTML comment :join weirdness

I have an HTML file with lots of pairs of lines like these:

<td colspan="1" rowspan="2" title="pb">bb</td>
<!-- pb bb -->

I want to join the two lines so that the comment comes at the end
of the preceding line so I do `:g/<!--/-1j`. It works in that the
two lines are joined, but the `<!--` disappears so that I get

<td colspan="1" rowspan="2" title="pb">bb</td> pb bb -->
^
|
Nothing here! --------------------------------+

I found a workaround

:g/<!-- /s//&&
:g/<!--/-1

but I can't shake the feeling that this is not correct behavior,
or is it?

TIA,

/bpj

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