Could this be causing sewer gas to leak from toilet?

Hi all, I bought a house last year and my upstairs bathroom has a heavy sewer gas smell coming from the toilet. I am 100% sure it is the toilet. I replaced the wax ring a couple of months ago when it started leaking, which fixed the leak but not the sewer gas smell. I am now replacing the wax ring again to see if it fixes the issue, but noticed this patch at the start of where I think the p-trap is? I don’t have any visible cracks in the toilet, but the patch looks kind of old (toilet is about 15+ years old). Could the sewer gas be coming from here? Or is it more likely the wax ring? I could really use your help and advice, thank you in advance!

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