Musescore playing mixed meters wrong.

OS: Windows 10 Version 2009 or later, Arch.: x86_64,
MuseScore Studio version (64-bit): 4.3.2-241630831, revision: 22b46f2

Please take a look at the attached score.

When simple and compound meters are mixed, either the beat or the division of the beat remains constant.
IF Division constant:
The speed of the eighth note remains constant throughout, but consequently, the beats are of unequal length. You will fell the the tempo speed up when moving from compound to simple meter, and slow down when moving from simple to compound meter.
IF Beat Constant
The quarter note in simple meter equals the dotted quarter note in compound meter.
Consequently, the speed of the eighth note changes.

At the attached file you'll see:

a) First system: I assigned quarter note equals to quarter note (from the "tempo" menu).
It plays exactly as it supposes to be, the speed of the eighth note remains constant throughout, but consequently, the beats are of unequal length.

b) Second System:
The same music written, same tempo, but this time, I assigned doted quarter not equals to quarter note (from the same "tempo" menu).
Here is the problem.

It should keep and steady beat and change the duration of the quarter notes between the simple and the compound meters.
It doesn't.

c) Third system: Prove of fail: So I "hacked" it by assigning quarter note equals to 100bpm over the simple meters, and assigned doted quarter note equals to 100bpm over the compound meters.
NOW it plays what it supposed to be playing in the second system.

Now bear with me for a second:
In the second system:
2/4, quarter note equals to 100 bpm. 6/8, dotted quarter note equals to quarter note.
Mathematically, doted quarter note equals to 100 BPM.

It should sound exactly the same as the third system

Am I missing something ?

To isolate the problem ( and get rid of possible problems with tempo change and symbols interaction), I wrote the same music in three separate files, and had the same results. These files are also attached.

Thank you in advance from your help.