taurus plot : scale is not adapted on Y2

Hello.
I did this tests at SOLEIL with taurus 5.2.0:

• run taurus plot "eval:Q(rand(333),'mm')" sys/tg_test/1/wave, (where sys/tg_test/1 is a tangotest device)
• with "Plot configuration", ensure "Q(rand(333),'mm')" is red and "wave" is cyan
• with "Model selection", add tango/tangotest/1/short_spectrum_ro (where tango/tangotest/1 is a tangotest device), and name it "short_spectrum_ro"
• with "Plot configuration", ensure "short_spectrum_ro" is green
  -> because "short_spectrum_ro" has higher values than the 2 other spectra, they appear as compressed at the bottom
• with "Plot configuration", put "short_spectrum_ro" on Y2 axis
  -> it becomes hard to see that spectrum, because Y2 axis does not adapt to it, but seems to adapt to the spectra on Y1
  And right clic on chart, Y axis, auto, changes nothing to this behavior
  
  
  I found no way to change this in my plot.