Yes, I use it in 4.27.2
Hmmm, You may need to reparent the instances, I had a Similar issue when I ported it to a new project Im working on.
Open Up the the instance Material and In the Editor Window there should be a 'Parent Asset' Or Similar, Select the Master Shader shader as the parent and that should do the trick! I Created the kit in 4.22 and had a similar issue when I loaded into 4.27.
I'll upload a 4.27 specific variant tomorrow if reparenting doesnt solve it, but it did for me.
Thanks for the Comment, and the support let me know if you have any further Issues!