works for me!

$ git clone ssb://%lWXxpVupn3mPxa4lXD/IfZkqA5vIHwXJeKMpbQ8KH60=.sha256 easy-ssb-pub
Cloning into 'easy-ssb-pub'...
Receiving objects: 100% (71/71), 135.65 KiB | 0 bytes/s, done.
Resolving deltas: 100% (31/31), done.

https://git.scuttlebot.io/%25lWXxpVupn3mPxa4lXD%2FIfZkqA5vIHwXJeKMpbQ8KH60%3D.sha256