@Andrewcama this could work (it's pretty old tho so might not work anymore) https://forum.plutonium.pw/topic/308/release-zombies-map-restart-clientside-issues-workaround.
You need to compile it yourself tho, here is a topic on how to do that: https://forum.plutonium.pw/topic/10/tutorial-loading-custom-gsc-scripts
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