I haven't read much on monero / this algorithm, so I'm not sure if it's particularly meaningful, but wikipeda references that being the case for most of 2017-2018 and then the algorithm was changed.
https://www.getmonero.org/2017/12/07/Monero-Compatible-Bulle...
Thank you! There's a lot of difficult-to-google info locked up in comments like this, and I truly appreciate the effort spent replying to randos like me :)