Invalid tar magic when streaming download

[Jeffrey Fetterman]

This does not work:
curl -sL https://api.github.com/repos/mirror/busybox/tarball/master |
busybox64 gzip | busybox64 tar -xf -

But this does (note the lack of using busybox64 on the last part):
curl -sL https://api.github.com/repos/mirror/busybox/tarball/master |
busybox64 gzip | tar -xf -

Tried using it with a non-busybox version of gzip, had the same
result, busybox64 tar couldn't handle it but every other version of
tar I have could.