Unable to complete mission, target was destroyed

During mission “Armonia delle sfere” , the target of the mission was to recover something for the first floor of a building.
The floor tile with the mission target was destroyed by a missile, and the “highlighted” target square seems to be moved on the corresponding ground tile.
However when sending a unit on the tile, it is not possible to trigger the target.

I guess it would be also fine to get a “mission failed” when it is destroyed, but in this way it is not clear.

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I had similar experience on steal research missions, but at those missions, gladly, there was usually an extra backup option title. Either access stairs or the real floor (or research apparatus) could be destroyed by friendly or enemy fire