staticman v3 comments pushed to github folder but not showing on page

[yuanyanhui]

I deployed staticman v3 to heroku which could push comments to my github repo, but the comments did not show up on the web page. My website repo is https://github.com/yuanyanhui/yuanyanhui.github.io.

I checked previous similar issues which did not help. Relevant settings in _config.yml are as follows.

repository: "yuanyanhui/yuanyanhui.github.io" # GitHub username/repo-name e.g. "mmistakes/minimal-mistakes"
url: "https://yuanyanhui.github.io"
twitter_username: username
github_username: username
minimal_mistakes_skin: default
search: true
comments:
provider : "staticman_v2"
staticman:
branch : "master"
endpoint : "https://solostaticman.herokuapp.com/v3/entry/github/"
allowedFields : ['name', 'email', 'url', 'message']
commitMessage : "New comment by {fields.name}"
filename : "comment-{@timestamp}"
format : "yaml"
moderation : false
path : "docs/_data/comments/{options.slug}"
requiredFields : ['name', 'email', 'message']
transforms:
email : "md5"
generatedFields:
date:
type : "date"
options:
format : "iso8601" # (default), "timestamp-seconds", "timestamp-milliseconds"

[yuanyanhui]

After changing path to the default "_data/comments/{options.slug}" in staticman.yml, comments showed up on web page.