Gitlab as oAuth2 provider generates small access and refresh tokens


I am working on integrating Gitlab as oAuth2 provider for users of my project, NetBird, to authenticate using their Gitlab users. But going through the steps and setting a flow with PKCE, I end up with very small access and refresh tokens.

Usually I see tokens with header, payload and signature, but something seems very off as the tokens has only around 65 chars.

Is this the expected size or I am doing something wrong?

No one from @gitlab team can help?