Exactly as title says. I can reproduce this 100% of the time.

Hey ! I have the same issue again !
Colytra version : FORGE-1.14.4-2.0.0.1
Caelus version : FORGE-1.14.4-1.0.1.12
Forge version : 1.14.4-28.2.0

Any idea on how to avoid it ??

Please follow the issue template. At the very least, I need version numbers for Forge, Colytra, and, if it's on 1.13+, Caelus.

• Colytra: 1.14.4-2.0-beta4
• Caelus (for 1.13+): 1.14.4-0.11
• Forge: 28.0.45

Observed Behavior: Changing from Survival to Creative back to survival remove elytra from chestplate.

Expected Behavior: Chestplate keeps Elytra when changing gamemodes

Steps to Reproduce:

1. Have a Colytra on
2. Change gamemode to Creative
3. Change gamemode back to survival
4. Try to fly

No crash report.

My bad, sorry for the inconvenience.
...

Crash Log: Please use a paste site like hastebin.

Update:
This will happen if I have the chestplate in my inventory or equipped when i change gamemode. If I put the chestplate into a chest before going into creative the chestplate still works after going back into survival.

I can't reproduce this. I can change gamemodes all day and the colytras both equipped and in my inventory still retain their elytras and I still retain flying capabilities. Are you able to reproduce this with just Colytra and Caelus installed? Also, does updating Forge to 28.1.0 fix it at all?

Updated Colytra to 2.0
Updated Caelus to 1.0
Updated Forge to 28.1.18
Kept all the same mods as I did in the past and the problem is gone :)