According to Hari Bhakti Vilasa 8.158
「 What Is Inedible (For the Purpose of Offering to the Lord)
In the Kurma Purana it is said:
"One should avoid eggplant, plantain, safflower, ashmantaka, onion, garlic, sour cereal, and the sap of trees." 」
The word used for "plantain" is "jalikasakam"/"jalikashakam".
My question is, why is there a restriction on plantain?
And secondly, perhaps much more importantly, why is plantain often offered as naivedya/prasada despite these restrictions?