Based on the CBCT findings, the upper left second molar (27) appears to have features suggestive of an endo-perio lesion with associated bone loss and possible crack lines. This is not considered a normal finding and may explain the pain while chewing. However, the exact diagnosis and prognosis depend on a clinical examination, vitality testing, periodontal assessment, and correlation with your symptoms.
Next Steps
I would advise you to consult an Endodontist/Periodontist at the earliest for a detailed evaluation. Avoid chewing hard foods on that side until the tooth is assessed. Early treatment can help prevent further progression and improve the chances of saving the tooth.