In creative, when you drop a sapling other than oak sapling, The item turns into an oak sappling. Its supposed to stay the sapling it was. when you drop leaves other than oak leaves, The item turns into oak leaves. Its supposed to stay the leaves it was. It does the same with grass and ferns wich turns intoa dead bush. Also all flowers all turn into poopies. all monster egg blocks turn into stone monster egg. slightly damaged and damaged anvils turn into anvils. All died glass panes turn into white glass panes. Mossy cobblestone walls turns into stone wall. Carpets turn into white carpets. all beds turn into white beds. All heads turn into skeleton skulls (including ender dragon) All banners turn into black banners. Those are minor glitches but staff should still be notified. I only tried with blocks from the "decoration" category.
@RoyalSkid @peraldon Hard to say, could be just a Minecraft thing or something to do with the pluggins affecting vanilla MC.
Yep, seems like ID data is being lost. Will notify the development team (albeit this will be a lower priority bug).