This isn't a bug. Maybe it's a feature request.

The message gives all the information you need. The --list function (or
-l) works only on .xz files not .lzma files.

The command lzma is equivalent to xz --format=lzma so it creates a .lzma
file. If you want to be able to print information about your compressed
file, you need to create it with xz (--format=xz or --format=auto) foo.

$ xz foo
$ xz -l foo.xz 
Strms  Blocks   Compressed Uncompressed  Ratio  Check   Filename
    1       0         32 B          0 B    ---  CRC64   foo.xz

** Changed in: xz-utils (Ubuntu)
   Importance: High => Wishlist

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https://bugs.launchpad.net/bugs/1291020

Title:
  unlzma -l fails to recognize files created by lzma

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