Transfer using BLF key calls pickup code instead of number

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I have set up a programmable key as follows:
- Type: BLF
- Value: 1234 (the number to monitor)
- Extension: *8 (pickup code)

The call status of the monitored number is displayed correctly and I can pick up incoming calls.

But if I do a transfer (press transfer, then the programmed BLF key), the phone initiates a transfer to the number *8 (pickup code) instead of the actual number 1234.