KV Put takes forever to write, or does not write at all

This is my backend that handles kv putting: https://github.com/minhperry/cf-worker-backend/blob/main/src/login/short.ts. As in the image, the request did indeed reach the backend with the corresponding body, which means the put is meant to be successful. However, it has been over 15minutes since I try sending this, everytime the backend does reply with a 201 but the KV put never succeeded