But now to the problem: In the pictures you can see how in bar 20 the 2/4 are displayed (only in the chrod view), but in the audio view the time signature change is not displayed.
I'm still a little confused. There are two images.
The first one includes the chord and audio views and it shows the bar of 2/4 in the audio but not in the chord view.
The second image is only the chord view, and shows bar 20 as 2/4 but there is no audio view to compare it to.
For consistency, can you show the bottom image to include the audio window, the same as the top image?