Custom Rule for button in D365 mobile app

Hi,

Using the Ribbon Workbench tool, I have set for a button an Enable Rule with an step of Custom Rule. This rule calls a JS function which perform some checks and return true or false.This process works well in the web.

But it doesn't work on the mobile app even I've updated the function to return always true in its first line.

I've seen other type of Enable Rules (Value Rule) works fine for the mobile app.

Is there any issue with Custom Rules (for Enable Rules) in the mobile app? Any of you has come across this? Thanks.