Miracle Adi

Witnesses who seriously testify that a miracle occurred, such as testifying that a certain dead person was lying headless and suddenly his head grew back to life and stood on his feet, are ostensibly disqualified from testifying. Otherwise, any denial of testimony can be explained by miracles. Similarly, sorcerers do not fear the penalty of a farha.
If so, from a purely halakhic perspective, will those who seriously testify that they have seen with their own eyes complete miracles of all kinds performed by people considered righteous be disqualified from testifying? (Or is it up to the judge to consider whether a certain righteous person or prophet has the power to perform such a miracle or not. Or is it a matter of being content that such testimonies do not reflect lack of trustworthiness in other areas (perhaps because they truly believe in themselves and their hearts, or some other reason) and therefore in other matters they are faithful as usual to spend money and perform Kiddushin).