The bug

Players in Adventure mode can use some items which create entities on use even if the items do not have the CanPlaceOn tag. This is inconsistent with other items like armor stands, paintings and item frames which require this tag.

Affected items

Item	Note
fireworks	-
minecart	Could be used for rail type distinction
boat	Problem: Would probably not work with water
lead	Problem: Player may not have lead item anymore when using it on a fence

Steps to reproduce

1. Switch to Adventure mode

   /gamemode adventure
   

2. Give yourself one of the affected items
3. Try to place them