Metadata Injection Failed for One Call

I’ve got an issue with {{customer.number}}.
In almost all calls, the variable gets rendered into the system prompt normally (the full phone number shows up in the OpenAI payload).

But in one specific call, the variable didn’t render at all.
The system prompt was missing the phone number completely, which made the model hallucinate the last two digits (“52).

Nothing changed on my side between calls, so it looks like interpolation just failed for that run.
Can someone check why {{customer.number}} didn’t get injected for that call?

Here is the call id: 019a9846-0c1b-722d-b0e1-f120a57501fd
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