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Z-fighting of iron bars / glass panes with the block below / above

You can attack and be attacked through glass panes

Angry Zombie Pigmen usually won't jump over 1-high transparent blocks to get to enemies.

Semi Transparent Glass Issue

Piston Glass Bug

Glass panes on slime block mess up bouncing

No thickness on glass panes

Glass panes and iron bars connect to barrier blocks

Fences/panes/walls/bars/torches connect to a number of non-solid blocks

Glass panes no longer attach to glowstone, sea lanterns, melons, leaves, pumpkins and jack o' lanterns

Glass panes & iron bars no longer connect to glass

Panel blocks UV does not look properly in north, south and east facing.

/setblock and /fill do not update block states

Torches can't be placed on iron bars or glass panes

Water flows through some glass panes

Button, Snow-Layer, Ladder, Tripwire-Hook, Lever, Torch, Vines, Fences, Walls, Iron-Bars and Glass-Panes can connect to Stonecutters

Rain not visible through glass

Item inputs are consumed when using the cartography table in creative