What is the authenticity of the story of Malik ibn Dinar, in which he narrates the vision that was the cause of his guidance, and is it a sin to disseminate stories of unknown authenticity?

Malik ibn Dinar was an ascetic, knowledgeable, pious, and content individual who earned his livelihood by writing copies of the Qur'an. It is narrated that the reason for his repentance was a dream he saw after he had been deeply engrossed in drinking alcohol. He dreamt that the Day of Judgment had come and a dragon was chasing him. Then he passed by an old man who was unable to help him. He reached a mountain where the children of the Muslims were, and he saw his deceased daughter who saved him from the dragon and said to him: "O my father, has the time not come for those who have believed for their hearts to become humbly submissive at the remembrance of Allah?" (Qur'an 57:16), explaining that the dragon represented his bad deeds, and the old man represented his good deeds, and that the children were waiting to intercede for their families. Malik awoke terrified and repented to Allah. This story's chain of narration is not authenticated, and it was not mentioned by the scrutinizing imams who wrote his biographies. However, it is recounted for its lesson, with the caveat that its authenticity is not established.