First make sure is broke off (likely) and didn't burn off from detonation (rare without other damage).
If the part is in the engine it could score the bore wall, imbed in the piston or head, or bend a valve.
If you have, or have access to, a bore scope you can look inside the cylinder for the plug tip and any possible damage.But it looks like the head will have to come off to make sure.
Sorry to hear about your problem.
If the part is in the engine it could score the bore wall, imbed in the piston or head, or bend a valve.
If you have, or have access to, a bore scope you can look inside the cylinder for the plug tip and any possible damage.But it looks like the head will have to come off to make sure.
Sorry to hear about your problem.