it should update the saved event data for all saved events automatically before a map change, I'll verify that these problems aren't occurring in the update that I'm releasing soon. Thanks for reporting these, if I'm able to replicate the problem I'll fix it in the update. I'm currently working in Saved Events code now so I'll just add it to the list of things I'm working on.
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This update took a bit longer than I expected but I kept finding more things to do, and admittedly still have other ideas but Version 1.5 of the Ultimate Event Spawner is now released. I've done a ton of testing and am hoping everything is working as intended and I didn't miss anything! Dev Log and maybe a tutorial video or two for the Spawner and Boundary System could be in the near future as well.
I hope this update helps you out!