It's not explicitly intended, but it's certainly not inherently invalid, such as following/ignoring yourself or creating a conversation with only you as a participant. Those are cases where we prevent an action to avoid problems.
Here, the action is perfectly valid; it is just borderline if it makes sense. Arguably it doesn't. However, we've had the ability to report your own content reported as a bug; there are times when things may not have an immediately obvious use to someone, but others may find value in it.
Admittedly, here it's a stretch; at best, it's probably mostly for testing. But is there an actual advantage to preventing it?