Chemical leeching is a big issue with all plastics, afaik. That is, they leech chemicals that are not fit for human consumption in trace amounts into food.

I heard that a researcher investigated many bioplastics and other better plastics and found that none of them improved on this issue. They did in fact face enmity when enquiring about the matter. I don't have a source for this unfortunately.

I'd be very interested to see if this barley plastic improves on the issue.