This seems to work.
knoppix@Microknoppix:~$ perl -E '
> @l = qw{ a bb c d e f g h };
> say sub { join q{ }, @_ }->(
> grep defined, map shift @l, 1 .. 3
> ) while @l;'
a bb c
d e f
g h
knoppix@Microknoppix:~$
I also piped the output through hexdump to check that there were no trailing spaces (which you do get without the grep).
Update: Using List::Util::min() to remove the need for the grep.
knoppix@Microknoppix:~$ perl -MList::Util=min -E '
> @l = qw{ a bb c d e f g h };
> say sub { join q{ }, @_ }->(
> map shift @l, 1 .. min( 3, scalar @l )
> ) while @l;'
a bb c
d e f
g h
knoppix@Microknoppix:~$
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