Aegisub 3.4.2 Audio Spectrum mode scale clipping?

[SUCM]

there seems to be some scale clipping for spectrum display. see below screenshot of Aegisub 3.2.2 (top) vs 3.4.2 (bottom)

3.2.2 graph is easier to work with as you can see the characteristics from the density and height pretty easily 3.4.2 graph zoomed/spaced out vertically (from clipped scale?) and is harder to see the boundaries when there are multiple sounds/voices overlapping each other

tried all options of Frequency mapping in Preference, but didn't find anything to improve visualization. Extended seems to be more clipping or zoom on the scale. Log and Compressed seemed to make thick bottom.