IsBlank function not working for Parent fields
Running into an issue using the isBlank function on a parent linked field. The field is blank (Verified using the quick filters on the view), but the formula returns the result as if the field had data. This is the same issue that is described in this post: "Invisible Characters in Link-To-Parent Fields??".
Example: if(isBlank({Field Name}),"Blank","Not Blank") will return "Not Blank" even through the field appears to be blank.

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Jon commented
I found the solution shortly after writing this. If anyone is running into the same issue, use = "" instead of isBlank.
Working Example: if({Field Name} = "","Blank","Not Blank")