When adding a phone number in CORE the Billing Address is being changed to Former Address even though no changes have been made to that address in CORE.
We are currently evaluating this issue and will update this article when we have more information.
Steps to Duplicate
1. Open Core 2. Search for Constituent 3. Click Add in Phone section 4. Choose Winter for Phone Type 5. Click Next 6. Add phone number 7. Click Save and Exit. 8. Go into RE 9. Click ConnectRE plugin 10. Click Use old way of syncing for now (Using new way does the same thing) 11. Click Process Now 12. Open the constituent 13. The Billing address now shows Former address