Not a Bug Fitness Event Bug

Description of the bug: (optional screenshot/video): I completed the Recent Fitness event a few hours ago, But I could not exit the last portal apparently due to full ETC Slot. I tried dropping my etc items to make space but it failed as the map did not allow items to be dropped. I was not lagging or anything as I was still able to communicate with the people passing by me. I desperately tried to enter the portal until the time ran out and I was brought to the Event exit map. GM Siao was there and she witnessed me clearing the stages but wasn't able to exit the stage via the last portal.
What is supposed to happen?: I should be able to exit the last stage and collect my completion prize.
Where did you find and/or notice this bug?: I was at the last stage (Stage 4) of the fitness event where I realised I could not exit the map via the portal.
A step-by-step guide to re-producing this bug (optional):
Extra information (optional): I did not have any etc slot upon completion and the map did not allow me to drop any etc items nor trade it away.

 

Hello?