There is a lower than 1% chance that I’d be the first person to submit a ticket about that issue if I did so, so no, I won’t be doing that. People have literally sent their devices in for repair over this, so trust me, the customer support team is aware.
Here are three threads full of people detailing the issue. Basically, if you lock the bootloader then in some cases the bootloader goes from unlockable to not unlockable. This has nothing to do with the rollback protection, as is evident by the fact that every other phone I’ve ever had hasn’t had that issue. Generally, if you lock the bootloader then you should be able to unlock it again if something goes wrong. Currently, the Fairphone 4 doesn’t work that way.
Here’s a post by hirnsushi that describes it better than I ever could: