In the rule “Timed Actions”, add the following paragraph:

If resolving a Timed Action would cause an illegal change to gamestate, the Timed Action must instead be left unresolved until its resolution would not cause an illegal change to gamestate. If it is on or past the time at which a Timed Action should be resolved, but that Timed Action cannot be resolved due to the resolution causing an illegal change to gamestate, the City who initiated that Timed Action may choose to revert that Timed Action and all of the gamestate changes that were made to initiate that Timed Action, with the exception that all gamestate values that were spent to initiate that Timed Action must remain spent for initiating that Timed Action.