Ion-infinite-scroll does not work in v1.0.0-beta. 14 "magnesium-mongoose"

The ion-infinite-scroll has broken in the beta-14 release. On scroll the list no longer adds new elements.
Please find below the code pen for the same.

Could you please suggest a work around for the same, I would not like to go back to 13 since I there are scrolling performance benefits in beta-14.