I'm at Knock Knock Café in Singapore https://t.co/CQvhF9PKxB
Central Region
[{'url': 'https://t.co/CQvhF9PKxB', 'expanded_url': 'https://www.swarmapp.com/c/bVno2ItJp98', 'display_url': 'swarmapp.com/c/bVno2ItJp98', 'indices': [37, 60]}]
KAMPONG BUGIS
["i'm", 'knock', 'knock', 'café', 'singapore', 'https://t.co/cqvhf9pkxb']
[]
knock knock
knock knock caf singapore
  [
    {"relatedness": False, "type": "none", "explanation": "This is not related to public housing or maintenance issues."},
    ]

It seems that the Twitter post "knock knock caf singapore" does not relate to a maintenance report feedback to a public flat house. It is possible that the user is simply mentioning the name of a cafe in Singapore, or sharing a knock knock joke unrelated to housing or maintenance issues.