At 2138 on 21 Nov 2021 

#fullmoon #moon #moonsighting @ Mandai, Singapore https://t.co/wQ50fzFAfD
North Region
[{'url': 'https://t.co/wQ50fzFAfD', 'expanded_url': 'https://www.instagram.com/p/CWijmuEvfJa/?utm_medium=twitter', 'display_url': 'instagram.com/p/CWijmuEvfJa/…', 'indices': [75, 98]}]
MANDAI EAST
#fullmoon #moon #moonsighting
2138 21 nov 2021 fullmoon moon moonsighting mandai singapore
  [
    {"relatedness": False, "type": "none", "explanation": "This post is not related to maintenance report feedback for public flat house."},
    ]

The given Twitter post does not seem to be related to a maintenance report feedback for a public flat house. The post mentions "fullmoon moon moonsighting mandai singapore", which does not appear to be a maintenance-related issue. Therefore, the answer is a JSON object with "relatedness" set to False, "type" set to "none", and "explanation" set to a brief explanation of why the post is not related to maintenance report feedback.