What I expected to happen was...
The potion arrow to stay in my inventory when I fired it in creative mode.
What actually happened was...
The potion arrow left my inventory like it would in survival mode when I fired it. I also noticed this happens in survival with Infinity on a bow which makes sense. Could this be the cause?
Steps to Reproduce:
1. Go into creative mode.
2. Take a bow and potion arrow.
3. Fire the potion arrow.
-I've seen other posts for 15w49a which don't seem to have been resolved but I've only found this out after I posted, sorry.