TIC12400-Q1: Enabling wetting current diagnostic functionality

Part Number: TIC12400-Q1
Other Parts Discussed in Thread: TIC12400

I'm currently wanting to enable the wetting current diagnostics on IN0 of the TIC12400 however when I do this none of the inputs change values anymore if their hardware input states change. The datasheet seems to indicate that there is no additional procedure for properly enabling this functionality (with the exception of the order in which the registers are written which I am complying with). Is this a behaviour that has been seen before or is there some additional configuration steps that I need to do in order to be able to properly do wetting current diagnostics during normal device operation?