while using the cferror tag, If the error has occurred in the error template means the request runs for a long time up to 20s and returns a blank page. But It logging stacktrace to 1000 lines in exception.log. Seems ACF also returns a blank page without any logs.

Consider above code,
Using type exception throws an error that occurred in the error template
Using type request returns blank page But logs the same stacktrace to multiple time
Using both types, logs single StackTrace with more than 1000 lines

StackTrace to multiple times for request type

StackTrace to 1000 lines for using both types