Transfer of message history to new iPhone fails after completion, thinks the new device is a linked iPad on subsequent tries

[s-gorrin]

• I have searched open and closed issues for duplicates
• I am submitting a bug report for existing functionality that does not work as intended
• This isn't a feature request or a discussion topic

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Bug description

When transferring messages from an iPhone SE gen 2 to an iPhone 16, transfer failed after reaching 99% and counting down seconds with message "The transfer couldn't complete. Make sure your devices are near each other and try again." When trying again, instead of initiating a new transfer, old device displays the message "To set up this iPad as a linked device, you must scan with your old iPad." When asked to register again on the new device, selecting "register without transferring" as indicated on the support page, registration was successful, but there were no transferred messages.

I can register without transferring on the old device, and messages are still there, but when I send messages the send fails and a popup notifies me that the device is not registered.

Steps to reproduce

• Initiate message transfer from iPhone SE gen 2 with many years of message history to new iPhone 16
• Wait 3.5 hours for transfer to finish

Actual result: Messages are still on old device, which is now unregistered, and new device has no messages but can be registered without transferring.

Expected result: Messages are transferred to new device, which is registered and functions as normal.

Screenshots

Device info

Old Device (OD): iPhone SE Gen 2
New Device (ND): iPhone 16

OD iOS version: 17.7 (21H16)
ND iOS version: 18.0.1

Signal version (both): 7.32

Link to debug log

OD debug log
ND debug log

The transfer attempt crossed midnight from October 12-13, so likely in the first logs on 2024-10-13.