Hi Yaron!
It looks like the for template tag does not parse the argument of the label:
This will not work, no <fieldset> is created arount the multiple-instance template
{{{for template|Contact Point|{{int:SA Contact Contact Point}}|label={{int:SA Contact Contact Point}} ||multiple|minimum instances=0 }}}
If I replace the {{int label with a plain string, it works:
{{{for template|Contact Point|{{int:SA Contact Contact Point}}|label=Contact Point ||multiple|minimum instances=0 }}}
Best,
Simon