set_blend_mode does not work on text surfaces

Setting a blend mode on a text surface makes the text disappear.

In the following example, the text surface is not painted on the destination surface.

local my_text = sol.text_surface.create{
  horizontal_alignment = "center",
  vertical_alignment = "middle",
  font = font,
  font_size = font_size,
  text = "my text"
  color = {127, 127, 127},
}
my_text:set_xy(160, 120)
my_text:set_blend_mode("multiply")
my_text:draw(dst_surface)