When i was testing some lag machines i noted that got on an "unloaded" (was invisible chunk)

I just ignored it, but placed a block then when going out of focus of these chunks two more were invisible BUT the blocks i placed were duplicated on another chunks (despite them were just visual)

IF you place a block inside other unloaded/invisible block they dont sound(meaning they are not being placed) but if there is the possibility of placing a block in the desired space you can place it

The physics are like falling on unloaded chunks at rate of ~1block/s whit no difference (i only tested on an ocean did not on air)

You cannot point at any of the "invisible" blocks in these chunks , got fixed unloading them/reloging

Bug for 1.8.9 1.8.8
Edit: tested on 1.13 worked but needded to do it a lot of times to get