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Every login-gated page worked perfectly on the live site and failed silently on localhost during testing — the session cookie had secure hardcoded to true, and browsers never send a Secure cookie over plain HTTP.
Media uploads worked fine right after uploading, then vanished the next deploy — plus a related gotcha from the same migration: CSRF/origin checks and signed URLs resolving wrong behind a reverse proxy.
Clicking "Sign in with GitHub" in the admin panel requested a URL that didn't exist — the admin's own client-side router was treating an external API link as one of its own internal routes.
A failed GitHub sign-in only ever showed a generic schema-validation error in the logs — GitHub's actual reason (a bad code, wrong client credentials) was being silently discarded.
Visiting a bare English-style URL for a post that only existed in Indonesian didn't 404 cleanly — it crashed the server mid-response with a ResponseSentError.
A batch of posts inserted straight into the database showed up correctly in every query, but the live homepage feed, category listing, and sidebar kept serving the version from before the insert.
Every save on one specific article failed with a bare 403 Forbidden that had nothing to do with the CMS — a hosting-provider WAF was anomaly-scoring the request body and blocking it before it ever reached the app.
A link-in-bio feature built on its own database tables kept throwing a body-parsing error on any request with a valid, owned ID — the root cause was never found, but moving the same data into a CMS content type made it vanish completely.
Taxonomy terms and author bylines copy automatically to a translated post — the SEO Open Graph image doesn't, and the gap is easy to miss until a share card renders blank.
We created a translated post with the wrong slug, corrected it with an update call, and accidentally 301'd our own live article to the new URL.
The language switcher silently disappeared on a post that had a real, published Indonesian translation — the bug was passing the wrong id into the translation lookup.
EmDash separates who can log in and edit (a user, with one of five roles) from who gets public credit on a piece of content (a byline) — two different systems that only overlap when you want them to. Here's how both actually work.