It appears when creating any part with a highlight. If you are looking at it through a neon part it will show up even if it’s occluded.
Here we have two parts highlighted, they are both currently occluded. The gray part is plastic while the black part is neon.
Here is what happens when you view the part through neon material.
Here’s a place to see it
Expected behavior
The highlight should remain occluded, but it is registering as “always on top” it appears.
1 Like
Salutations!
Thanks for bringing this to our attention.
A ticket was filed, and we’ll start investigating.
I tried to reproduce this issue with the place you linked here, but it didn’t occur to me.
Is it possible that the issue happens only during playtesting in Studio?
A Repro Placefile for Studio would be helpful for us to keep investigating.
If you need assistance or info on how or which info/files would be relevant to investigate this topic, please refer to the How to post a Bug Report - Bug Reports - Developer Forum | Roblox
Thanks for understanding!
Have A Nice Day!
I’m so sorry for not mentioning, it only does this on mobile!
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Hey there!
Don’t worry, thanks for letting us know.
I was able to reproduce it now on mobile.
Thanks for the report!
We’ll follow up when we have an update for you.
Have a Nice Day!
2 Likes
Any updates?
This is also happening with MeshParts that have a SurfaceAppearance
I can provide a repro file privately if needed
This should be fixed now. Please let us know if highlights work correctly with neon for you
2 Likes
It’s working as normal now, I appreciate you and everyone who helped to fix this! 
Still experiencing this issue.
Note that there is a solid part between the player and the highlighted parts.
SurfaceAppearance’s transparency or opacity at fault?
Is this with neon? Can you please create a repro file for us?
catinpsyop
(catinpsyop)
10
I’m not using any neon instances for my repro, just a highlight:
Attached a repro file in private information
I cannot access that 
If you don’t want to share with the world, could you please send it to me via PM? Thanks a lot!
system
(system)
Closed
12
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