Duplicate blocks in debug world

In the debug world, blocks are supposed to appear once.

Some blocks are actually appearing twice. The blocks at x, 70, 185 are also appearing at x+2, 70, 1.

Some blocks known to be affected (probably all of the ones at z=185):
minecraft:stripped_spruce_log[axis:z]
minecraft:note_block[instrument:harp,note:13,powered:true]
minecraft:note_block[instrument:snare,note:9,powered:true]
minecraft:note_block[instrument:bass,note:5,powered:true]
minecraft:note_block[instrument:bell,note:1,powered:true]
minecraft:note_block[instrument:guitar,note:22,powered:true]
minecraft:note_block[instrument:xylophone,note:18,powered:true]
minecraft:yellow_bed[facing:west,occupied:false,part:head]
minecraft:purple_bed[facing:south,occupied:false,part:head]
minecraft:powered_rail[powered:false,shape:north_south]
minecraft:moving_piston[facing:east,type:sticky]
minecraft:fire[age:1,east:false,north:false,south:true,up:false,west:false]