I would stay
well clear of any bond fund as a place to park cash with interest rates this low if I was you. If this is the fund you are talking about
https://smartshares.co.nz/types-of-f...sh/nzbondtrust
it has a three year time frame focus. Any investment in medium dated bonds at this point in the interest rate cycle is subject to significant capital risk. The diversification in the portfolio won't save you because all bonds of similar duration face the same capital risk from rising interest rates.
If you want to use a Smartshares fund to park your cash use this one
https://smartshares.co.nz/types-of-f...sh/nzcashtrust
SNOOPY
(Who speaks from experience when, some 20 years ago, I moved from an overseas share fund to an overseas bond fund to keep my capital 'safe'. The ensuing bond crash of the time meant it was a few years before I got my capital back!)