I reported this in the chat but I want to leave it here because there may be something wrong in the build pipeline or release process that should probably be looked into.
The Windows build for 0.8.2 doesn't seem to support @custom NatSpec tags. Later builds (0.8.3, 0.8.4) do not have this problem.

Reproduction: https://github.com/frangio/solidity-0.8.2-windows