I know this is a regression since I was able to use the program in 0.4.3RC1.
We unhid this with r72495 -> linking to CORE-11915.
And we hack-fixed it in 0.4.3RC1 by reverting r72495.
I already verfied: it crashes with and without running themesvc.
We must either fix it properly or workaround it for 0.4.4 rls again.