After I set a static page, I copied/pasted the blocks from the “Frontpage” template to the new static page I created. Once the blocks were moved out of the template and into the actual page, things worked just fine. Originally, my entire home page was created in the Frontpage template and I didn’t have a page at all, that’s when things didn’t work.
I think I figured out the issue. I was adding the Spectra blocks in my template, as I’m use FSE. Once I moved the blocks over to the page and out of the template, the blocks once again worked with 2.10.3.
I’m seeing something similar. I’ve added a slider block to a test page and it works using Spectra 2.10.3, but when I add the same block to my home page, it doesn’t work.
However, if I downgrade Spectra to version 2.8.0, it works on the home page as expected.