[Bug] Projects using a cloned version of glace (Green Bridge) cause the game to crash

[Whurrhurr]

Describe the bug

Title.
all cloned versions of green bridge include

		<on_enter_clbks>
			<value_node value="nil"/>
		</on_enter_clbks>

in their main.xml, this causes issues.
game crashes with this

Application has crashed: C++ exception
[string "lib/managers/menu/missionbriefinggui.lua"]:3943: attempt to call local 'clbk' (a string value)

SCRIPT STACK

close_mission_briefing_gui() lib/managers/menu/menucomponentmanager.lua:3259
at_exit() lib/states/ingamewaitingforplayers.lua:612
trans_func() lib/states/gamestate.lua:14
_do_state_change() core/lib/utils/game_state_machine/coregamestatemachine.lua:124
end_update() core/lib/utils/game_state_machine/coregamestatemachine.lua:104
end_update() lib/setups/setup.lua:982
end_update() lib/setups/gamesetup.lua:878
end_update() lib/setups/networkgamesetup.lua:33
core/lib/setups/coresetup.lua:602

Steps to reproduce the issue

make a new project that is a cloned heist using glace/green bridge as it's base, trying to play the level will crash after the blackscreen. trying to restart will also result in a crash.

Log file

No response

Minimal reproduction

No response