Could maintainer bump rawhide file to 4.25 so when we have LZMA with magic support we will know our tarballs compressed with LZMA aren't looking like 'corrupt' files from file 's point of view :-)
Ufff... They manage to release new file versions so often that one can't even go for a vacation. Will do if nothing breaks again.
I may have a patch for you and upstream, since I now co-maintain lrzip it uses LZMA + LZO to compress files, and this has a different magic header. This will be a different bug though.