Crack in marble effect fireplace - floor problem?

Caveat

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The crack (horizontal, across the full length of the fireplace with about 3mm gap) has been there since we moved in over a year ago and has not deteriorated that I can see. Thought nothing of it until someone pointed out that it was unusual, and often a sign of sinking floor - which worried me a bit. Another person dismissed this explanation totally - both tradespeople but not really linked to flooring/fireplaces.

Anyone any views on this?
 
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