Yup, That issue is known and is not intentional. the doors that use that key need a flag to not consume the key on use. as is with some items being mislabeled on the text prompt when you pick them up. quite a few have the diaper pack prompt and I haven't prioritize it yet as I want to make sure the final area plays well and isn't needlessly cruel since Thorn is already really pushing it.
The other known issue is there are a few objects that need flags corrected for the save system to work as built. That will likely be ironed out a bit after Halloween since it has always been extremely fickle.