Sequoia 15.5 bug? Adding calendar .ics file gives Zulu time (I'm in U.S.)

[Jumpthesnark]

I just installed Sequoia 15.5 today on Mac Mini M2 Pro, up from 15.4.1.

All seems fine, but I made some appointments and when the organization I made an appointment with sent me an .ics file to add to my calendar, it added the appointment at Zulu time (Greenwich Mean Time). I am in California, as is the organization I made the appointment with.

• My machine's time is set correctly to PDT.
• Settings>General>Date & Time>set date and time automatically is turned on
• Settings>General>Date & Time>set time zone automatically using current location is turned on
• Settings>General>Date & Time>Time Zone: Pacific Daylight Time
• Settings>General>Date & Time>Closest city: Cupertino, CA
• Calendar>Settings>Advanced>Turn on time zone support is checked on
• Settings>General>Language & Region>Region is set to United States.

Soon after that, I made a second appointment, and that .ics file also added the appointment to my calendar in Zulu/Greenwich Mean Time.

I opened the .ics file in TextEdit and here's the info it contained. I have blurred non-essential information.

Anyone else experiencing calendar weirdness like this in 15.5? Thanks!