Swelling following bone graft (Photo)

I am undergoing dental work and had an implant fitted with a bone graft in August 2023. Since then I have had persistent swelling above the tooth. I have been advised to have a gum graft, followed by removal of the bone graft in 3 months before replacing the crowns. I would like to know could this be a sign of bone graft failure and would you recommend the same advice? I have been told it is likely due to excess bone graft material being present. My X-rays have shown no signs of infection.