I usually run as root (yeah yeah, I know;), with evolution set up to run as and in the home directory of an unprivileged user.  After this update to 2.40.5, when evolution is started, you get a banner "Something has gone wrong when displaying the message", which repeats as you move from message to message, so it's graveyard dead, all you can do is shut it down.

If manually started as that unprivileged user, things are a little better for a very loose definition of better - the thing doesn't moan, but also does not display message text, so is effectively just as dead.

Reverting to 2.38.6 and nailing it to the floor gets evolution working again.

FWIW (not much) I even built (steal packages from osc and rpmbuild locally in leap-15.5) everything required to get evolution+data-server upgraded to factory rev (3.48.4) in one of my VMs, and when that build-fest was over, shiny new 3.48 evolution was broken in the same way as stock 3.42 was.. so use locally built packages while waiting for hiccup to get resolved didn't work out, so I'm back to nailing the working 2.38.6 webkit2gtk3 to the floor.