Bug in April 2023 update

Anonymous I have confirmed this. It appears that once you set your Dynamic format string that even when you change it back to Whole number for example and it says that you will lose your dynamic format string that the dynamic format string is still somewhat in effect. I would log this in the Issues forum. 

To get your original format back, switch the format back to Dynamic once again. This will give you the base format of "0". Then, switch the format back to Whole number. This will remove any vestiges of the original dynamic format string.

I'm just guessing but I'm thinking that perhaps dynamic format strings work by creating an Annotation on the measure and that removing the annotation is somehow not working correctly. Just a guess though.