There is a quiet frustration that builds when your tools stop working without warning, and this reader's experience with Office Scripts captures that perfectly. Their scripts did not vanish into thin air; they remain in the OneDrive folder, but Excel can no longer see most of them, and the one that remains visible triggers a "Bad Request" error pointing to a Microsoft static content server. This is not a user error, and it is not a lack of technical competence. It is a preview feature behaving exactly as preview features too often do: unreliably, and without a clear path forward for the person caught in the middle.
The practical takeaway here is not that Office Scripts is broken beyond repair, but that anyone relying on preview tools for real work is borrowing time from their future self. The user did everything right. They stored scripts in the designated folder, they tested them, they ran them successfully. When things broke, they restarted, signed in and out of OneDrive, and cleared temp files. None of that matters because the problem is not on their machine. The error URL points to Microsoft's static content delivery network, which suggests the issue is server-side, a sync or authentication hiccup between the Excel client and the script storage layer. No amount of local maintenance will fix that, and telling this user to "just check your folder" misses the point entirely.
What this means for anyone in a similar position is straightforward: do not anchor your workflow to a feature that is explicitly in Preview and then assume the issue is yours. If you have scripts that matter, export them as backups, keep a plain text copy outside of OneDrive, and test your automation environment after any Office update. More importantly, when you hit a wall like this, do not waste days troubleshooting locally. File a support ticket, report the bug with the exact error URL, and be prepared to wait. The user's decision to post in a public forum is the right instinct, because community knowledge often surfaces workarounds faster than official channels.
The real lesson here is about expectations. Preview features are not a promise; they are an invitation to experiment, not to build your daily operations on sand. This reader did not do anything wrong, and their scripts are likely recoverable with the right support intervention. But the fact that they had to ask "has anyone experienced this before" after already trying the standard fixes tells you everything about the gap between what Microsoft promises and what it delivers in these early stages. Keep your scripts backed up, keep your patience intact, and keep pushing for answers, because the alternative is accepting silent data loss as a feature.