Cannot join. The following mod event handlers are not identical between you and the server. This indicates that the following mods are not multiplayer (save/load) safe. (See the log file for more details):

mod-cargo-bay-loader

57.284 Error ClientMultiplayerManager.cpp:1079: mod-cargo-bay-loader was not registered for the following events when the map was saved but has registered them as a result of loading: on_tick (ID 0)
57.284 Error ClientMultiplayerManager.cpp:86: MultiplayerManager failed: "" + multiplayer.script-event-mismatch + "
" + "
mod-cargo-bay-loader"
57.284 Info ClientMultiplayerManager.cpp:608: UpdateTick(40299752) changing state from(ConnectedLoadingMap) to(Failed)

I got it working
-- Changes made:
-- 1. on_tick is permanently registered.
-- 2. Removed dynamic script.on_event(on_tick, ...) registration/unregistration.
-- 3. Removed script.on_load() registration.
-- 4. on_tick immediately returns when no dirty surfaces exist.

-- Apply these edits to your original file:

-- In mark_surface_dirty(), REMOVE:
-- script.on_event(defines.events.on_tick, on_tick)

-- Replace your on_tick function with:

on_tick = function()
ensure_storage()

if next(storage.dirty_surfaces) == nil then
return
end

rebuild_if_startup_settings_changed()

for surface_index in pairs(storage.dirty_surfaces) do
local surface = game.get_surface(surface_index)
if surface then
update_surface(surface)
end
end

storage.dirty_surfaces = {}
end

-- DELETE this entire block:

-- script.on_load(function()
-- script.on_event(defines.events.on_tick, on_tick)
-- end)

-- Finally, add this ONCE near the bottom of the file
-- (after all function definitions is fine):

script.on_event(defines.events.on_tick, on_tick)