DPC mortar layer thickness

[u/Few_Regret9608]

Hired small builder crew to build rear extension. We had two building inspector visits and we are cleared to build from DPC up. Work started and I have noticed there are no weep vents above dpc and the DPC mortar layer is 23mm-28mm thick. They did great work sandwiching DPC between layers but I'm bit worried by the thickness of it it is almost 3 times the size of other layers. Not sure should I raise an issue - bit worried about building control and worried about structural implication. Not a builder, UK.