UTC 10:30 We have confirmed that new and old sandboxes are now being correctly displayed. There is a chance that there workspaces created between approximately July 13 10:40 UTC - July 14 10:00 UTC that may still be invisible. If you are missing a workspace in your workspace list, please contact us through support, where we'll fix these cases individually. We sincerely apologize for the trouble.
UTC 8:25 We're working on a fix, we expect it to be ready in approximately 2hours. Next update in 2 hours.
UTC 7:20 We have identified the cause and working on a fix. As a workaround, you can create a workspace in Development branch, where it should display correctly. We have confirmed that this is only an issue with listing the workspaces, so no data is lost. Next update in 1 hour.
UTC 6:40 We're investigating reports of users not being able to new or recently created workspace in list of workspaces. Preliminary results show that this is only an issue with the listing, the workspaces do actually exist. Next update in 30 minutes.