I have faced it too.
Facebook SDK 5.2.1 (which is currently available in this forum) itself has an issue with iOS 13. You have to use the latest Facebook SDK for iOS 13.
If you are using local builder then download the attached frameworks from safari and move those to the local builder Libs folder. Its not the latest one though it will solve the auto cancelling issue.
I have faced it too.
Facebook SDK 5.2.1 (which is currently available in this forum) itself has an issue with iOS 13. You have to use the latest Facebook SDK for iOS 13.
If you are using local builder then download the attached frameworks from safari and move those to the local builder Libs folder. Its not the latest one though it will solve the auto cancelling issue.