When spectating from the perspective of a moving minecart (tested with regular, furnace, and hopper minecarts), the clouds jump back and forth many times a second. Affects both fast and fancy clouds.
MC-106117
Clouds flicker between different positions when spectating minecart
Resolved
Fixed
2
Confirmed
cloud, flicker, minecart, spectating
Minecraft 16w32b, Minecraft 16w33a, Minecraft 16w35a, Minecraft 16w36a, Minecraft 1.11
Minecraft 16w50a
Retrieved
Confirmed. Happens with regular minecarts too (so I assume all minecarts).