Nswag leaves much to be desired. I deployed an OpenAPI server and the initial deployment partners using nswag begged us to change the API to suit an issue that was reported and nswag hadn't fixed in years. I respectfully told them to pound sand and deal with it manually or better yet be a good citizen on the ecosystem that they are using for free and contribute a patch. Last I checked they were still manually patching their codegen on each deploy. /Shrug

Nswag has important issues that are many years old still in their backlog.

1.6k issues, oldest unresolved 7 years old:

https://github.com/RicoSuter/NSwag/issues?q=is%3Aissue+is%3A...