nifi 2.3.0 fails to connect to bitbucket using GitHubRegistryClient

I'm setting up nifi 2.3.0 with GitHubRegistryClient to by-pass the nifi registry component.When configuring GitHubRegistryClient:

1. I used the bitbucket repo https clone url
2. I created PAT(Personal Access Token)
3. I verified that I can git clone the repo in the container where nifi is also running

However, when I try to import flows, I got this error:

Unable to get branches for registry with ID 5xxxxx-xxxxx-xxxxb: Invalid request from host ##.##.##.#: Note that Bitbucket does not support Git's legacy HTTP transport protocol.

It seems that bitbucket is complaining about nifi git client is trying to connect over http? However the url is pointing to https and the PAT is for https as well. (https://confluence.atlassian.com/bitbucketserver/http-access-tokens-939515499.html)I tried to set nifi.security.ssl.protocol=TLSv1.3It does not fix the issue.