You should investigate this reading the logs (journalctl).
Each desktop session provider may use their own method for session init (multiple ways).
Upstream sway should know better about it. Also Wayland sessions are different from usual Xorg sessions.
I am sorry I had no time to research upstream for such info.
Busy with coding 
. You may want to test my latest project, which is BTW a dex alternative, among other things.
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