updating existing wiki page - 500 Internal Server Error

Summary

I got 500 Internal Server Error whenever I try to update wiki page using API. I am using example from Wiki API https://docs.gitlab.com/ee/api/wikis.html#edit-an-existing-wiki-page

Steps to reproduce

curl --request PUT --data "format=rdoc&content=documentation&title=Docs" --header "PRIVATE-TOKEN: {{redacted}}" "https://gitlab.com/api/v4/projects/{{projectID}}/wikis/home"

Example Project

example project id: 20843363
curl --request PUT --data "format=rdoc&content=documentation&title=Docs" --header "PRIVATE-TOKEN: {{redacted}}" "https://gitlab.com/api/v4/projects/20843363/wikis/home" {"message":"500 Internal Server Error"}

What is the current bug behavior?

{"message":"500 Internal Server Error"}

What is the expected correct behavior?

{"message":"200 Page updated"}

Results of GitLab environment info

gitlab.com