AMF not extracting

[quamis]

I'm running
bash <(curl -s "https://raw.githubusercontent.com/markus-perl/ffmpeg-build-script/master/web-install-gpl-and-non-free.sh?v1")

And after a while I get

building amf - version 1.4.29
=======================
AMF-1.4.29.tar.gz has already downloaded.
Failed to extract AMF-1.4.29.tar.gz

In the build folder, AMF seems to be downloaded and extracted

$ ls ffmpeg-build/packages/*AMF*
ffmpeg-build/packages/AMF-1.4.29.tar.gz

ffmpeg-build/packages/AMF-1.4.29:
AMF-1.4.29

$ ls -R ffmpeg-build/packages/AMF-1.4.29/ | wc -l
1204

I tried removing the AMF archive & folder, re-ran the script, and I got the same result.

Any ideea what's happening?

[quamis]

this doesn't happen if I git clone the project