The Register API of Consul returns 200, but the registration was not successful

I observed a phenomenon where after calling the Register API of a Consul cluster and receiving a 200 status code, I am unable to find the newly registered service in Consul. In this situation, how did this occur?
Condition: There are already tens of thousands of services under this ServiceName, and I observed this log in the Consul cluster:

[WARN]  agent.fsm: EnsureRegistration failed: error="failed inserting node: Error while renaming Node ID: "1a30db0e-aafe-569a-53eb-21d1f9707abd": Node name 173client is reserved by node aa968167-fa99-d9cd-03b0-41b579b1bd72 with name 173client "