Cracking of Lime Mortar in newly erected wall

Hi All, we have a small extention being built, the walls were erected 2 weeks ago and they put a roof on it last week. I was inspecting the walls today and the external wall in brick seems ok but the internal wall in blocks has cracks showing in lime mortar ( a picture attached) which made me concerned. The foundations are extra deep because our neighbours have a tree (2.7m) so I do not think it is subsidance but it was very warm when the walls were erected so I perhaps it is linked to that? I do not know a lot about this but should I be worried and if yes, what should be addressing when talking to my builder? thank you for your thoughts, with best wishes, Marta


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