We had a desync when using this mod and some others.
When looking through the code I noticed the below which I think if this setting is changed mid game would cause a desync for later joining players.

control.lua:
local max_deaths = settings.global["player-dying-mitigation"].value

As far as I can see in the docs, that setting can only be changed by the server admin for the save game file. It's not unique per user, so it shouldn't cause a desync even if you change it mid-game.

It's a global runtime setting and not a startup setting

Setting = 1
Server start
Player 1 joins - local variable setting of 1
Setting = 2
Player 2 joins - local variable setting of 2

Or have I missed the updating of all existing players local variable value when the runtime setting is changed?

Ah I see what you're saying. Yep, that'll do it. I'll upload a fix shortly. Also wanted to fix that feature to stop counting walls - biters tend to blitz the walls then stop splitting.

We are getting desyncs with this and many other mods. From trial and error they stop with the removal of this mod. Looking at version 1.0.4 I can't see anything bad though.

Know its been 7 months, fairly certain this feature is causing desync every #xth structure death or so. Temp fix suggestion: add a toggle to disable this feature all together?

I've added a toggle to disable mitigation -- I'm not really sure if it will help (I can't reproduce the error) but see if it helps any.