Thanks for letting me know. That event was almost the end of me because of how many problems there were, so honestly the fact that it's gone this long without a bug report is a blessing. I'll take a look at that and see if I can figure out the cause.
Viewing post in Crossdressing in Camelot comments
It's not a secret passage to the yellow button, you just need to deactivated both green buttons before you push the white button, keeping the gas in the room while also giving you access to the piss button. Then after you press the piss button it makes it safe to press the green button and let you get to the chest on the left. (Fun side note, I tested this out again to make sure I hadn't messed it up, and found that when you press the green button to get to the treasure it causes a visual bug, making the yellow wall look like it's down, but it still functions properly and blocks off the gas, lol. I'll have to fix that as well.)