I have cut maybe 15 SIMs to use them with Dual SIM Adapters like this one
Dual Sim (there are many others) and only 1 SIM did not survive (I claimed warranty and told the customer care lady that it failed after only 2 days. They sent me a new one for free....)
It can happen and it is common, that there occurs a little gap between contacts and plastic of the SIM after cutting. This gap should be filled with epoxy glue to ensure correct contact pressure.