From the mailing list thread:

Re: 2 kirigami fixes for a point release

> Kirigami seems to be rather unstable, I wonder if anything can be done to
> improve upon that [*].

One important thing seems to have been getting sloppy in those repos;
mandatory code reviews.
That's an easy thing to enforce, and we know it makes a huge difference to
code.

Even if no-one comments, the extra delay of it running on your own
system delivers a lot.

I fully agree.

(CC'ing the developer lists)