I tried this block with a couple of different themes, and the align-full option didn’t work on the fronted with most (tried a few Varia child themes, and some older ones like Independent Publisher, Shoreditch, Business). The only one where the option worked properly on the frontend was TwentyTwenty.

Steps to reproduce the issue

1. Activate one of Varia child themes (for example Maywood), or an older theme, like Independent Publisher 2
2. Add Google Calendar block to a post or page. Set to full width. It should display properly in the editor.
3. View the post/page on the frontend. Notice it does not occupy full width of the page.

Video demo of the issue: https://cloudup.com/c6An_yxEIyC

There also seems to be an issue with the wide width option - Google Calendar block is not centred, and not as wide as other core blocks when set to wide width. See this example using Shawburn theme:

Found while testing the Google Calendar block.