Crankcase gasket

[CTR]

Hello,
Yesterday we did a check to the connecting rod bearings and the crankshaft, everything fine.
After i gave the crankcase a good clean, fit a new (original) gasket and new screws (original ) and when i were out to test drive we find out a massive leak from the crankcase by the gearbox side.
I follow the tighten torques and segment too.
Anyone have some tips or explanation for what went wrong?

Thanks a lot!

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[CTR]

Problem found.
After fitting the new sealant we find out a crack near by the sump bolts.

I think i need to first tighten the 16mm bolts that connects the sump to the gearbox and then the 22bolts from the sump.