Andy Coleman

That's intentional. It makes the blocks "fuse" at the faces where the glass blocks make contact to allow you to look through them clearly.

Saw something that could be another instance of this bug when leaving a Pillager tower on a server with a high spawn rate, where 5 pillagers spawned behind me but... didn't react aside from turning towards me, so it was clear they were targeting me, but couldn't act in response. No firing of crossbows or movement.

I too encountered this issue on a server running release 1.14.1. I fell down to layer 11 (was mining a vertical shaft, 1x2 blocks wide and had made a tower of scaffolding to climb up and slipped as I was climbing) as I died, and went to hit respawn, it appeared that the chunk was "unloaded" and the entities of my items fell through into the void. However, when I respawned and went back to the place where I died (climbed down the scaffolding) I couldn't pick the items back up at all. The entities moved as normal when I tried pushing them with water, and breaking blocks around them to reach them (in case they were actually glitched through the wall). I disconnected and reconnected to the server, and still couldn't pick them up.