Played around a bit more and can say: for REMAINING_TIME build 20.0.72 is fine .73-.77 isn't.
Looks as if some other things got messed up since build 20.0.73. There appears a bug which makes impossible to save some changes to Visualizations.
I use this Vis:
<MJV Version="1.0">
<Component GUID="36267E6D-70E1-435e-9E2A-428EEA2D3C7E" Name="Flush">
<Properties>
<OnEquation>on=1</OnEquation>
<Color>0x000000</Color>
<Rectangle>0,0,1,1</Rectangle>
<FlushEquation>f=1;</FlushEquation>
</Properties>
</Component>
<Component GUID="B21F9002-EF2E-4d5b-9D40-F61B8F3B34D8" Name="Spectrum Analyzer">
<Properties>
<OnEquation>on=1</OnEquation>
<DrawSource>0</DrawSource>
<Channels>0</Channels>
<DrawPeaks>0</DrawPeaks>
<DrawBars>1</DrawBars>
<Mirrored>0</Mirrored>
<ImageFile>COVER_ART</ImageFile>
<PeakGravity>512</PeakGravity>
<BarGravity>1024</BarGravity>
<PeakTerminalVelocity>0</PeakTerminalVelocity>
<BarTerminalVelocity>0</BarTerminalVelocity>
<PeakThrowForce>0</PeakThrowForce>
<FFTElements>400</FFTElements>
<FrequencyScale>1</FrequencyScale>
<TopWeight>5</TopWeight>
<UpScale>100</UpScale>
<BarWidth>0,0050999997183681</BarWidth>
<BarSpacing>0,0015000000130385</BarSpacing>
<PeakHeight>0</PeakHeight>
<PeakColor>0xFFFFFF</PeakColor>
<Gradient>{3, 1} [[0x404040,0x000000,0x000000]]</Gradient>
<MainRectangle>0,0,1,1</MainRectangle>
</Properties>
</Component>
<Component GUID="BBEC668A-420F-4faa-856D-880DACE05B5B" Name="Text">
<Properties>
<OnEquation>on=1</OnEquation>
<Text>[Tanz]</Text>
<RenderDelayMilliseconds>0</RenderDelayMilliseconds>
<RenderDuration>0</RenderDuration>
<TextLocationEquation>x1=0;y1=0;x2=1;y2=.1</TextLocationEquation>
<FontName>Calibri</FontName>
<FontSize>0,0599999986588955</FontSize>
<TextColorEquation>r=1;g=1;b=0;</TextColorEquation>
<TextAlignment>1</TextAlignment>
</Properties>
</Component>
<Component GUID="BBEC668A-420F-4faa-856D-880DACE05B5B" Name="Text">
<Properties>
<OnEquation>on=1</OnEquation>
<Text>REMAINING_TIME</Text>
<RenderDelayMilliseconds>0</RenderDelayMilliseconds>
<RenderDuration>0</RenderDuration>
<TextLocationEquation>x1=0;y1=0.2;x2=1;y2=1</TextLocationEquation>
<FontName>Calibri</FontName>
<FontSize>0,1599999964237213</FontSize>
<TextColorEquation>r=9;g=9;b=9;</TextColorEquation>
<TextAlignment>5</TextAlignment>
</Properties>
</Component>
</MJV>
Saving this in 20.0.73 to 20.0.76 messes up the color of Spectrum Analyzer. This line is affected:
<Gradient>{3, 1} [[0x404040,0x000000,0x000000]]</Gradient>
Saving it changes the first color value to something like 040040.