Minecraft Woodland Mansion Search Command

I tried to find a woodland mansion using the new command for it but it didn't work. I ended up finding one on my own and used the command and it told me no mansions existed on my map while I was standing inside of one. I also was not able to trade with the villagers to get a map to the mansion like you are suppose to be able to in the new update. Please look into this and get back to me as soon as you can. Thank you for your time