I grouped the loop block so that I could add a css class in the "advanced" field, and the interface won't reload the page in the backend anymore. The frontend page still works (the homepage), but I can't edit it, only getting a 404 error.
I deactivated the blocks plugin, and deleted the block. After reactivating the plugin, I went to the page to recreate the block, but it was still broken. I also tried to rewind the page to a version before the error occurred, and though I can still successfully interact with the page in the front-end, I still cannot edit it in the backend.
I need the exact steps that you did so that I can attempt to replicate the issue. I will like to see if this is replicable on a fresh install. If it is then this is something I will need to report.
The last thing I can remember doing was to select the view block and convert it to a group block so that I could add a css class in the "advanced" section on the right.
I tend to save and refresh for every step I do, so changes I had been making before then had applied and not broken anything before then.
I've circumvented the issue by recreating the page completely and replacing it. But let me know if you can reproduce the original issue, and if it represents a bug that I should avoid.
