I am seeing discrepancies between calculated expressions and values in Field Maps vs. my Smart Form configuration in Map Viewer. For example, finding the nearest polygon works in Map Viewer but in Field Maps it occasionally says "Failed to calculate" in red letters underneath the question.
Also, more specifically there is an Arcade script to calculate an ID number using the next sequential number based on asset type. For example, in Map Viewer it works properly where structure type A will be number 3000 and structure type B will be number 2000, but in Field Maps they are both showing as "1001" indicating that something is up with how Field Maps is processing the script.