I upgraded Manjaro today and got Evolution 3.38, which dumped its core when started. It turned out to be related to firejail. To solve it, I just added this to my .profile in my home directory:
export WEBKIT_FORCE_SANDBOX=0
The source for the solution came from here:
https://bbs.archlinux.org/viewtopic.php?id=259928
Ideally, this would somehow be fixed either in Evolution, bwrap or the firejail profile, depending on where the right place to fix it is.