The bug
The lighting of the item held in the player's hand is based on the player's viewing angle in third-person mode.
To reproduce
Hold any item
Enable third-person mode
Move your head full up and full down
→ ❌ You'll see that the item gets brighter or darker along with the head's movement.
Linked issues
Attachments
Comments
in first person it has always been there, but the effects weren't as noticeable as now
I have uploaded a video that shows how it used to be in 1.14.4, both in first person and third person views
Hmm, yeah, the same effect seems to be present in 1.14.4, but it's way more noticeable in 19w41a. Anyway, I've changed the ticket up so that it now only applies to third-person mode again.
Seems to be fixed in 19w42a.
Can confirm. This does also happen in first person mode, see the attached video.