agl-service-homescreen crashing

I'm seeing agl-service-homescreen consistently crash on startup on Raspberry Pi 4 since the 3 commits for SPEC-3796 were merged to master, backtrace is:

I tested backing those 3 commits out, and it started up fine.  I tried reproducing with a qemux86-64 build, but it did not happen there.  It also did not happen when I made an rpi4 image with the dbg-pkgs image feature turned on, which does seem to suggest some form of race condition.  I'll continue tomorrow to try to get things in place so I can hopefully get a coredump and look at it with gdb.  I'm attaching the full journal just in case something in it is helpful.