Wait Behind Platform Line sounds like a micro-optimization until you are near Tianfu Square after the fountain starts and kids treat it like a free water park.
A colleague from Brazil once got locked out because the fingerprint reader hates sweaty thumbs. The fix took less time than telling the story.
Try this once: write the rule on your phone lock screen for three days. If it survives, it is yours.
Works for me in Chengdu humidity.
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