Ibn ‘Abbas reported the Prophet ﷺ as saying This is an ‘Umrah from which we have benefitted. Anyone who has brought sacrificial animal with him should take off ihram totally. ‘Umrah has been included in Hajj till the Day of Judgment. Abu Dawud said This is a munkar (uncommon) tradition. This is in fact the statement of Ibn ‘Abbas himself. (Using translation from Abū Dāʾūd 1790)
عَنِ النَّبِيِّ ﷺ قَالَ هَذِهِ عُمْرَةٌ اسْتَمْتَعْنَا بِهَا فَمَنْ لَمْ يَكُنْ مَعَهُ هَدْيٌ فَلْيَحِلَّ الْحِلَّ كُلَّهُ فَقَدْ دَخَلَتِ الْعُمْرَةُ فِي الْحَجِّ إِلَى يَوْمِ الْقِيَامَةِ