There is a known problem with passing chain level prompts to its module components if the value of the max length limit is set for the module's prompt definition to be less than or equal to 3.
Values of prompts from the chain can be passed to its direct components using {#n} where 'n' is the number of the prompt on the chain. However, if the prompt on the module is defined such that it is limited to 3 or less characters this will lead to an issue as {#n} is 4 characters.