bls12-381 Basic repeated exponentiation test Failing

[sourav1547]

I am trying to use the gnark and gnark-crypto library for one of my project. I noticed that the following very basic test is failiing. I am not sure whether I am using the library incorrectly or there are some bugs.

Snippet from go-mod

require (
	github.com/Workiva/go-datastructures v1.0.53
	github.com/consensys/gnark v0.8.0
	github.com/consensys/gnark-crypto v0.9.1
	github.com/stretchr/testify v1.8.1
)

Actual Test where the assertiion fails.

import (
	"fmt"
	"math/big"
	"testing"

	bls "github.com/consensys/gnark-crypto/ecc/bls12-381"
	"github.com/consensys/gnark-crypto/ecc/bls12-381/fr"
	"github.com/stretchr/testify/assert"
)

func TestMul(t *testing.T) {
	g, _, _, _ := bls.Generators()
	var a, b, c fr.Element
	var ga, gab, gc bls.G1Jac

	a.SetRandom()
	b.SetRandom()
	c.Mul(&a, &b)

	ga.ScalarMultiplication(&g, a.BigInt(&big.Int{}))
	gab.ScalarMultiplication(&ga, b.BigInt(&big.Int{}))
	gc.ScalarMultiplication(&g, c.BigInt(&big.Int{}))

	assert.Equal(t, gab, gc)
}

[ivokub]

assert.Equal performs byte-by-byte comparison, but you are using Jacobian coordinates. Either normalise to affine coordinates or use Equal method.