Same issue here. reached out to support / Slack / Discord everywhere. commenting for outreach
Topic summary
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Issue: On Shopify app proxy pages, the Liquid customer object (customer) was unexpectedly empty, while it still worked in theme templates (e.g., customer.tags | json). This led to broken functionality and major outages for multiple apps.
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Impact and reports: Several developers confirmed the problem, citing unhappy clients and escalating through Support, Partner Slack, and Discord. Screenshots/status images were shared indicating Shopify was aware and investigating.
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Update from Shopify: A Shopify representative stated a fix had been shipped and asked for confirmation on whether the issue persisted.
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Resolution: The original reporter confirmed the fix resolved the problem. No further errors or reproduction steps were posted.
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Status: Resolved. No root cause or outage timeline was disclosed, and no additional action items were identified within the thread.