About Animsequence and Anim Montage frame difference.

The image below shows an animation sequence that plays a total of 90 frames for 1.5 second.

When I created anim montage using this animation sequence it changed to the image below.

44 frames of animation in 1.5 seconds.
And I wonder if there is a way to use anim montage as the frame rate of the original animation (60 frames per second).
Thank you for reading.

Still happening in 2020 with no documentation or solutions.

This problem still exists in 4.26.2. Bug or feature?