Why is mīm pronounced clearly in «أَلَمْ يَجْعَلْ»?

Al-Fīl and Quraysh: Applied Iẓhār, Ikhfāʾ, Idghām, Madd and Waqf

• The next letter is a doubled mīm
• Hamzah precedes madd
• The following letter is yāʾ
• The following letter is bāʾ