Half blocks invisible in Festive mashup

After downloading 1.8, the festive mashup makes lots of non-full blocks completely invisible.

 

Blocks affected:

Seagrass

Kelp at close range

Crops

Single plants

Double plants

Bamboo

Scaffolding

Torches

Levers

Leaves (with fancy leaves on)

Trapdoors

Doors

Anvils

Possibly more