We have a Circom circuit that fails after we have done a major upgrade from circom 0.5.45 to 2.1.7. After some debugging it is clear that the Poseidon hashes computed via circomlibjs do not match with those calculated with circomlib within our circuit, see test.js.
npm install
npm run build
npm test
Needs circom@2.1.7 installed on the system.