Unexpected user ID shown instead of name

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Hi, apologies if this is a duplicate issue, I have looked but couldn't see anything that looked similar.

Steps to reproduce

1. Create a SAML user
2. Write a message to them

Expected behaviour

The message preview for a user what is sent should be consistent. E.g. when I @[person] I expect the message to show the same, rather than be replaced by their user ID.

Preview

Sent

Actual behaviour

The message is not consistent with the preview.

Talk app

Talk app version: 15.0.6

Custom Signaling server configured: yes

Custom TURN server configured: yes

Custom STUN server configured: yes

Browser

Microphone available: yes

Camera available: yes

Operating system: macOS

Browser name: Chrome

Browser version: 114

Nextcloud Version: 25.0.7 Enterprise

Use the issue's reproduction steps with a SAML user in Talk 15.0.6, comparing the message preview with the sent message in Chrome. Trace the mention handling responsible for replacing @[person] with a user ID; done means the preview and sent message display the same user name. No source file or test is named, so the relevant Talk code and coverage must first be located.