That’s really strange! There should be a hammocks section in the diary after you fill the witness statements and view the cream. Is that not showing up?
I had the same issue, the Hammocks section wouldn't show up for me when I first looked through all of them (including the one with the face cream and robe), but it showed up after I closed the game and started it again.
Oh no, that shouldn’t be happening. Thanks for letting me know! Was the hammocks section visible immediately after you restarted or did you do anything else?