Of course Handoko,
You can comment out MinSize instead of AutoSize and it works too.
But the issue is still hiding back there.
Now you Confirmed it, it needs to be reported on the bug tracker, I guess.
P.S.
The reason I use TForm.AutoSize and alTop-ed controls inside for some small dynamic forms is High-DPI support. and it works really really good and automatic. (except this Maximize issue).