Fence block states revert to default

Fences keep reverting to default block state (i.e. they disconnect from adjacent fences, gates or blocks) upon loading into the world. I noticed that this only affects the area that the player left the world in, so if you go further away, the fences are fine.

Fundamental issue as fences need to keep mobs in/out of certain areas, but this allows mobs to walk in between fences. See attached screenshot for example.

Very inconsistent so hard to give directions to replicate bug. Block updates cause them to correct themselves up until any turn in the fencing.

To replicate: Place fence[s] either in a line or adjacent to a block. Save and quit the game, then load back in. Observe fence[s] disconnect.

Expected: Fences retain block state upon loading.

Actual: Some fence block states revert to default until updated.