Atm, the journal is invisible even though the prompt to interact comes up. Kept going back in case it was a rendering issue but its not been there.
I’ve found it in single player.
Used admin ghost powers and the journal is underneath the floor where it should be.
It literally needs raising up a few inches.
The Gem in the Tower achievement is still bugged tho. Used your interactive map and I’ve been to every location you have on there