Mixer size not always remembered

This has been mentioned before - without solution - but I think I can add new information that may help track the issue down. I am using Version 3.6.2.548021803, revision 3224f34 on a Windows 10 machine. If I adjust the size and position of the undocked mixer then it is not remembered when I next open Musescore if I have Musescore running full-frame when you save the score. It DOES if I am using a non-maximised (reduced/floating) window but not if it is running maximised. Not the biggest of bugs but annoying having to adjust the mixer size every time you open a score! Despite that I have to say that Musescore is an amazing program so thanks to all those who contribute.