Equations at Draw

I am a new user of LibreOffice and while I was exploring the features of Draw, I encountered something strange. I inserted a chart using dots and lines and only one column. I choose “Linear” and “Show equations” from the “Trend lines” menu. The pairs of data I inserted at the data table for the Y and X axis beggining from row 1 are the following: 0-0, 1-1, 2-2, 3-3, etc. The equation was supposed to be f(x)=x. Instead, the equation that appeared was f(x)=x-1. Can you tell me if this is an error or is there something I don`t understand?

No problem with Libo 3.3.4 - 3.5.5 - 3.6.0.1.
I only can do the same changing the X-range to began 1 row after Y-range.

Hi Anonymous,

If you’re still able to reproduce this behavior on the latest release, you may have uncovered a bug. Please consider filing a bug so we may help discover the source of the problem.