2020 Subaru Impreza

P205/50R17 Driver side rear tire suddenly experiencing lots of pressure compared to others. Example 27.7 psi on a subject tire compared to 32.0 psi on others after approximately one week of garage storage. Upon inspection, tread separation/ visible cracking is visible on approximately 1/2 of the circumference of the tire. No warning lights from the vehicles tire pressure monitor system has activated and no trouble codes for that system or others are present, indicating the vehicle at least is not aware of a problem with the tire. Tire pressure sensor reports good battery, accurate pressure when compared to Tire gauge pressure, and reports temperature of approximately the ambient temperature (at the moment, is currently 57.0°F). Vehicle has been mostly garage kept since purchase due to Covid. Has experienced normal North Carolina Summer temperatures though recently within two weeks North Carolina has had some of the coldest weather in some time (Lows mid teens, highs low 30s). Manufacturer has been contacted and currently awaiting response. With my previous experience and knowledge in the automotive industry, it appears that the visible cracking on the tire is relatively new. The inner portions of the cracked area, for instance, are clean and free of any debris, dust or dirt.