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Multiple axes don't display correctly if yaxis has no trace

In the case where four traces are to be plotted, trace 1 on yaxis, trace 2 on yaxis2, …, the graph looks alike:

var data = [trace1, trace2, trace3, trace4]

Although if the first trace is omitted, the result is corrupted:

var data = [trace2, trace3, trace4]

Always will be in the graph visible only the last trace. The rangeSlider displays them correctly.
Here I prepared the code for testing:

Originally I came across this problem while using the deleteTraces method. This method works well with all but the first index:
Plotly.deleteTraces(plotDiv, [0])
Is that behaviour a bug in Plotly or am I perhaps missing something in the layout settings?
Thanks for help!