could someone explain something-- I have a faint understanding of the "Standard Model" of physics, which lays out a pattern of particles and forces that has so

could someone explain something-- I have a faint understanding of the "Standard Model" of physics, which lays out a pattern of particles and forces that has so far held up to experimentation i.e. the Higgs boson fit neatly into the model, exactly where the model predicted it would go. The standard model predicted the Higgs, and the Higgs was found exactly how the model predicted, right? But I've never heard of this X17 particle before. Is this something the standard model has predicted? Does it go against the standard model, strengthen it, or neither?