Group Service Account API POST only works with group ids but not with URL encoded path

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How to reproduce

I want to create a group service account on a self-hosted premium instance.

I have a top-level group named "user" with the group id 512.

The following command works:

curl --request POST --header "PRIVATE-TOKEN: secret-token" "https://git.example.com/api/v4/groups/512/service_accounts"

=> {"id":308,"username":"service_account_group_512_3a8565725ac3330996b803e2cab6d908","name":"Service account user"}

This one does not work:

curl --request POST --header "PRIVATE-TOKEN: secret-token" "https://git.example.com/api/v4/groups/user/service_accounts"

=> {"message":"400 Bad request - User does not have permission to create a service account in this namespace."}

Expected Behavior

Endpoint works with id and url-encoded-path.

Actual Behavior

Endpoint only works with id.

Specifications

Gitlab server version: 17.8.1