“Shabsai Tzvi and Yaakov Frenk were rejected, not because they turned out not to be moshiach, but because they became resho’im, openly rejected observance of halacha and told their followers to commit serious aveiros, and eventually committed shmad.”
Milhouse: Many Gedolei Yisroel condemned and denounced Shabsai Tzvi long before he started committing public aveiros and was exposed as a fraud.