The top face of the Hovering Hourglass (only the top, not the bottom) does not allow a block to be placed on it. Instead, when placing a block, it places it on the side opposite the player. For a clearer description, the vector representing the crosshair passes right through the top face as if it doesn't exist. Whichever face of the hourglass it hits next is the one the block is placed on.
Pics (don't judge my paint.exe ;-;):

Those 5 blocks were placed without any adjacent block (except the HG itself) to place them on, from the top face of the hourglass.

Sorry for eyerape.

Scanned through the log, nothing of notice there, just a void between load and save.

_{^{I feel kinda useless, dumping all of these strange arcane bugs on you ;~;}}

Same with the Pylons.
On Sun, Dec 27, 2015 at 10:55 PM howtonotwin [email protected]
wrote:

The top face of the Hovering Hourglass (only the top, not the bottom) does
not allow a block to be placed on it Instead, when placing a block, it
places it on the side opposite the player For a clearer description, the
vector representing the crosshair passes right through the top face as if
it doesn't exist Whichever face of the hourglass it hits next is the one
the block is placed on
Pics (don't judge my paintexe ;-;):
[image: 2015-12-27_22 25 20]
https://camo.githubusercontent.com/281a5c84ec5c95b0d7d69c0fc6c6173f26bc0961/68747470733a2f2f636c6f756467697468756275736572636f6e74656e74636f6d2f6173736574732f31353631363035352f31323031333636352f64363830346637322d616365392d313165352d393466332d626430653037376531623330706e67
Those 5 blocks were placed without any adjacent block (except the HG
itself) to place them on, from the top face of the hourglass
[image: 2015-12-27_22 37 11]
https://camo.githubusercontent.com/334f661a402ecdaec3ec36598e29c16d0d20772c/68747470733a2f2f636c6f756467697468756275736572636f6e74656e74636f6d2f6173736574732f31353631363035352f31323031333736332f64343465646264362d616365622d313165352d386439382d663261386530613862303035706e67
Sorry for eyerape

Scanned through the log, nothing of notice there, just a void between load
and save

I feel kinda useless, dumping all of these strange arcane bugs on you ;~;

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#1696.

Vanilla bug that happens if the block's hitbox goes above the 1 diameter block. Not fixing.