Already on quark 175, got this rather crappy clip but it gets the point across:
https://www.youtube.com/watch?v=1nw5Ewz4M9U

This is the download for the testing world I used:
http://www.mediafire.com/file/6px9ud1do91cnw0/Multi_Lava_Cobble_Gen_ilmango.zip/file

Log from the event in the video:
https://gist.github.com/WarlordWossman/cc18ac6d89b11130249e5b28bbad8763

Using push limit 16 in the config if that matters, should be rather easy to reproduce with the test world from ilmango that I also linked.