I also hit a very frustrating issue in minio where CORS headers weren't being set properly and there were many similar cases in their issues history. Their response was basically "works for me, sorry".

I'm pretty sure there was something weird going on with how minio was reading the config state, as I definitely was not the only one hitting it. Luckily I only had to use it for local testing in the project, but the whole thing didn't leave me feeling good.

[1] https://github.com/minio/minio/issues/11111