To follow up, there is also two additional new bugs:
1 - I can no longer click and drag the calendar horizontally to go into the past or the future. All Legend now does is drag as if I was attempting to create a new event on the calendar.
2 - Related to my first inquiry where some of my Google calendars are no longer present, I can see them clearly on the desktop version but not on the web browser version.
The desktop version is on the left and the browser version is on the right.
The first error I just mentinoed regarding clicking and dragging is a brand new one, but I suspect the second one has been an issue for quite some time (in addition to events failing to load 1-3 weeks before/after the current week as pointed out in the OP).