Wrong width of bar in bar plots

I would have expected a single bar with a width of 0.05 here:

library(plotly)

plot_ly(
  type = 'bar',
  x = 0.2,
  y = 10,
  width = 0.05
) %>% 
layout(
  xaxis=list(range=c(0,1))
)

Instead, I get a single bar with width 0.6 (and not 0.05).

Similarily, I would have expected two bars, each of width 0.05 here:

plot_ly(
  type = 'bar',
  x = c(0.2, 0.5),
  y = c(10, 8),
  width = 0.05
) %>% 
layout(
  xaxis=list(range=c(0,1))
)

Instead, it shows two bars, but not of width 0.05.

Only if I'm plotting 4 bars (or more) do I get the correct width (of 0.05) for each:

plot_ly(
  type = 'bar',
  x = c(0.2, 0.5, 0.6, 0.7),
  y = c(10, 8, 7, 3),
  width = 0.05
) %>% 
layout(
  xaxis=list(range=c(0,1))
)

Checking with a Javascript codepen, using

var trace0 = {
  type: 'bar',
  x: [0.2],
  y: [10],
  width: 0.05
}

var layout = {
  xaxis: {range: [0, 1]}
}

var data = [trace0]

Plotly.newPlot('myDiv', data, layout);

does give the expected result.

Start by reproducing the three R examples using plot_ly() and layout(), then compare their bar widths with the JavaScript CodePen example. Trace how the R inputs are translated into the bar plot entry point; done means one- and two-bar plots honor width = 0.05 as the four-bar plot and JavaScript example do.