Probar una vez

Debug: agent_id = 64877
Debug: post_id = 0
Debug: owner_id = 73
Debug: owner_phone = 123456789
Debug: owner_whatsapp = 123456789
Debug: is_singular_estate_property = false
Debug: trace = Agent ID 64877 is a post, wpestate_user_for_agent returned: 73 | Agent ID 64877 resolved to owner_id 73 | Owner ID 73, phone: 123456789 | Owner ID 73, whatsapp: 123456789