To reproduce, chests won't generate in abandoned mineshafts, also well the mesa ones.
Comments 4
But they could have just put in regular chests as a placeholder, like how abandoned mineshafts generated normal chests before 1.5.
And also, stronghold storage rooms share the same bug. You can see for yourself that they are missing, by using a seed like "robot".
This is because they have not added minecart chests yet. Works as intended