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{"@context":"https://schema.org","@type":"DiscussionForumPosting","headline":"Changing milestone of issue does not work","articleBody":"## Description of the problem, including code/CLI snippet\r\nI am trying to change  milestone of issue. I understand that I should set `milestone_id` with valid ID of milestone (reference https://github.com/python-gitlab/python-gitlab/issues/612 as well as https://docs.gitlab.com/ee/api/issues.html#edit-issue). The problem is that it seems to not work. The code passes without any error or warning but issue still has the old milestone assigned.\r\n\r\n```\r\n    project = ctx.projects.get(265)\r\n    issue = project.issues.get(729)\r\n    issue.milestone_id = 1372\r\n    issue.save()\r\n```\r\n\r\nI am sure that I am setting correct milestone ID as I am getting it just few lines prior using code:\r\n```\r\n    group = ctx.groups.get(GROUP)\r\n    new_milestone = next(group.milestones.list(title=new_milestone, as_list=False))\r\n    print(new_milestone.id)\r\n```\r\n\r\n## Expected Behavior\r\nMilestone changes.\r\n\r\n## Actual Behavior\r\nNothing happens.\r\n\r\n## Specifications\r\n\r\n  - python-gitlab version: 2.6.0\r\n  - API version you are using (v3/v4): v4\r\n  - Gitlab server version (or gitlab.com): 13.10.3\r\n","author":{"url":"https://github.com/Cynerd","@type":"Person","name":"Cynerd"},"datePublished":"2021-04-30T10:32:22.000Z","interactionStatistic":{"@type":"InteractionCounter","interactionType":"https://schema.org/CommentAction","userInteractionCount":3},"url":"https://github.com/1432/python-gitlab/issues/1432"}