I used to be very gung ho on IPFS, until I learned that the content ID does not depend solely on the content of the file. When one puts a file into the system one can choose different hashing algorithms, which will cause the content ID to be different obviously. However, even when using the same algorithm the content ID will change depending on how it is chunked. I would expect any sane system to consistently produce the same hash/content ID a file. I can see if the system is moving from using SHA2 to SHA3 that it could be stored twice. Don't know whether they have changed things so that a consistent content ID will be produced or not.