I think this is just a Jira/bitbucket thing. If you add a feature branch, that's how the naming convention defaults. I've been seeing it for years.
But for branches in addition to Feature/, we're seeing Hotfix/, Modernization/, you name it. If you're parking branches for a long time without completing them, I'm 100% appreciative they're categorized.
(Personally, for long term parked branches I prefer `{username/dev name}/` branches because then you know who the owner is without having to look at the commit log and guess based on recent commit authors. But that's the fun thing about branching conventions, there are so many to choose from, many of which have been around forever.)
[0] https://nvie.com/posts/a-successful-git-branching-model/