Is it a new free plan? Do you have a google sheet attached? The problem is that there shouldn’t be anything that should incure an update on a free plan, but if you happen to have a google sheet attached (which isn’t permitted in the free plan), it triggers an update and puts you over your limit of 0 updates.
It feels like a bug because you shouldn’t have been allowed to end up in that situation in the first place, but the only solutions right now are to wait until the end of your monthly cycle, or create another free team and transfer your app there.