Torches dissapearing from walls

Torches dissapears from walls after a while of playing, say I place a torch on a wall down in the ground. I play for 6 hours.
I go to bed. Play some more. The day after I come back and the torch is gone. Wtf are they not permanent? ((((((((((((((((((((((((((((((((((((((((((((((((((((((((((((((((((((((((((((((((((
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Win10.