Unsurprisingly, the new experimental update broke things
The scenario level caused a non-recoverable error.
Please report this error to the scenario author.
Error while running event level::on_player_created (ID 24)
...ng/Factorio/temp/currently-playing/lib/oarc_gui_tabs.lua:80: attempt to index global 'mod_gui' (a nil value)
stack traceback:
...ng/Factorio/temp/currently-playing/lib/oarc_gui_tabs.lua:80: in function 'DoesOarcGuiExist'
...ng/Factorio/temp/currently-playing/lib/oarc_gui_tabs.lua:252: in function 'SetOarcGuiTabEnabled'
.../Factorio/temp/currently-playing/lib/separate_spawns.lua:122: in function 'SeparateSpawnsPlayerCreated'
...Data/Roaming/Factorio/temp/currently-playing/control.lua:217: in function <...Data/Roaming/Factorio/temp/currently-playing/control.lua:207>
Unsurprisingly, the new experimental update broke things