Summary: When a Lead is created with mobile_no, mobile_no value gets lost (mobile_no value is overwritten by phone value)
It is backport of https://github.com/frappe/erpnext/pull/26116
Steps to reproduce
[1]Create a Lead.
[2]Enter
Person Name(lead_name): before_fix
Under Contact section,
enter Phone(phone): 11 and
Mobile No.(mobile_no):22
[3]Save it
[4] F12,
cur_frm.doc.phone : 11 (correct)
cur_frm.doc.mobile_no : 11 (incorrect, it should be 22)
[5]Under Address & Contact section ,check contact_html it shows
before_fix
Phone: 11 (Primary label is missing)
Phone: 22 (incorrect, it should be Mobile No:22, also Primary label is missing)
Actual:
mobile_no value is lost. it is overwritten by phone value
following is image with error (before fix)

Expected:
mobile_no value should be retained
following is image after fix
