In computer science, at least, where I have published several papers; it is common to use "We", even if the paper has only one author.
This is partly tradition, but my advisor said we do it for the same reason we teach classes that way: On the whiteboard (or a slide show), as the only teacher and the only one writing, you still say to the class, "Now we are going to apply an elliptic transformation to this formula..."
It is inclusive; it implies you and the person you are teaching are a team working together.
When we are teaching a child, we often do the same thing: "Okay, good! Now what do we do next?" Even though you are referring to them alone.
A distinction here is we see some papers that will say "You will notice that these values are asymptotic to a parabolic function..."
But that could always be changed to "We notice that these values are asymptotic to a parabolic function..."
This is a style choice in computer science (which is usually involving math and algorithms), we adopt this inclusive teaching style, whether it is a sole author or a dozen authors.
Off and on I've read academic papers in mathematics, statistics, physics and engineering, often related to CS, but I don't recall their style.
Another effect, I think, is it prevents the perception of braggadocio and self-promotion. "I" can sound self-promoting, While "You" and "We" tones that down.
Another approach in CS is avoiding a designation altogether. "Clearly, these two functions are proportional..."
"Notice the lower curve in Figure 3 is asymptotic to the upper curve."
"After cancellation, the only variable remaining is 'c'. which can now be computed directly."
Stuff like that.