Zitat von MITs Forum am 5. September 2023, 0:00 Uhr

A logic issue was addressed with improved state management. This issue is fixed in macOS Ventura 13.2, iOS 16.3 and iPadOS 16.3. A user may send a text from a secondary eSIM despite configuring a contact to use a primary eSIM.

References
https://support.apple.com/en-us/HT213605
https://support.apple.com/en-us/HT213606