I tried to downgrade to 3.101.1 by just uploading it over the existing 3.102.0. Even though WordPress recognized it and allowed it to happen, after activating the same error occurs and WordPress seems to recognize it again as 3.102.0, so my guess is the downgrading doesn’t work.
Do I need to remove 3.102.0 first? And if I do that, will settings, newsletters, schedules etc. be lost?