There's a bug where harness not showing on ghast after equipping on it but after saving and reloading the world the harness is visible on that ghast.
MCPE-225668
Harness on Happy ghast not visible(for temporarily)
Resolved
Duplicate
1
Hi!
Thank you for your report!
We're actually already tracking this issue at MCPE-225276, so I will resolve and link this ticket as a Duplicate.
I suggest also to browse through the main issue for potential fixes.
If you would like to add a vote and any extra information to the main ticket it would be appreciated. Thanks!
Quick Links:
📓 Issue Guidelines – 💬 Mojang Support – 📧 Suggestions – 📖 Minecraft Wiki