`from_buffer()` issue with file-5.47

Using archlinux, with python-magic 0.4.27, there seems to be an issue with file-5.47-1 and python-magic when using from_buffer

In [1]: import magic

In [2]: magic.from_file("sample.mp4", mime=True)
Out[2]: 'video/mp4'

In [3]: magic.from_buffer(open("sample.mp4", "rb").read(2048), mime=True)
Out[3]: 'application/octet-stream'

In [4]: magic.from_file("sample.webm", mime=True)
Out[4]: 'video/webm'

In [5]: magic.from_buffer(open("sample.webm", "rb").read(2048), mime=True)
Out[5]: 'application/octet-stream'

after downgrading to file-5.46-5 everything works

In [1]: import magic

In [2]: magic.from_file("sample.mp4", mime=True)
Out[2]: 'video/mp4'

In [3]: magic.from_buffer(open("sample.mp4", "rb").read(2048), mime=True)
Out[3]: 'video/mp4'

In [4]: magic.from_file("sample.webm", mime=True)
Out[4]: 'video/webm'

In [5]: magic.from_buffer(open("sample.webm", "rb").read(2048), mime=True)
Out[5]: 'video/webm'

Start by reproducing the from_buffer and from_file examples on Arch Linux with python-magic 0.4.27 and file-5.47, then compare with file-5.46-5. Inspect the from_buffer path and its interaction with libmagic. Done means video/mp4 and video/webm are returned for the buffer calls under file-5.47.