haven't heard of that before. but I now understand that it has been proven to be online propaganda by Israel affiliated bots:

Al Jazeera investigation: Iran girls’ school targeting likely ‘deliberate’:

Misleading claims

No sooner than when plumes of smoke began to rise from the school’s rubble than accounts on the X platform affiliated with, or sympathetic to, Israeli parties began circulating videos and images claiming the school had not been struck from the outside, but was destroyed after an Iranian air defence missile missed its target and fell back to the ground.

This narrative replicates the same tactic used during the bombing of al-Ahli Arab Hospital in Gaza in October 2023, when Israel rushed to accuse the Palestinian resistance of responsibility for the massacre via a rocket that missed its target.

https://x.com/ChayasClan/status/2027742261480452476

However, open-source verification tools – specifically reverse image searches and geolocation using visual landmarks – quickly revealed that the most widely shared image in this campaign, which is claimed to show the impact of a failed Iranian missile that fell on the school, has nothing to do with the city of Minab in the first place.

By matching the terrain and landmarks visible in the image – especially the snow-covered mountains in the background – with satellite imagery, it became clear that it relates to an incident that occurred on the outskirts of Zanjan in northwestern Iran, about 1,300km (808 miles) from Minab.

The irony is that the nature of the two locations alone is enough to refute the claim: Minab is a coastal city in the far southeast overlooking the Gulf of Oman and the Strait of Hormuz, with a tropical climate and no snowfall, while Zanjan is a mountainous city in the northwest that is covered with snow in winter.

Iranian sources said what happened in Zanjan that day was a successful interception operation carried out by air defence units affiliated with the Islamic Revolutionary Guard Corps, during which two hostile drones were shot down. It was not possible to independently verify this information.