chrismurphy added a new comment to an issue you are following:
``
Looks like the minimum squashfs-tools needed to support this feature is 4.3-21
* Mon Jun 24 2019 Bruno Wolff III <bruno(a)wolff.to> - 4.3-21*
*- Add zstd compression support (Sean Purcell via
github.com/plougher/squashfs-tools)*
It's possible the nested ext4 image in the squashfs image is contributing to this
problem. Opened #8646 to separately track the possibility of using plain squashfs images.
``
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https://pagure.io/releng/issue/8581