Blank are not displayed correctly

[oxonium0215]

Describe the bug
Blank is only displayed in the indent column

To Reproduce
Steps to reproduce the behavior:

1. Use the config attached below

opts = {
    chunk = {
        enable = true,
        chars = {
            horizontal_line = "─",
            vertical_line = "│",
            left_top = "╭",
            left_bottom = "╰",
            right_arrow = ">",
        },
        style = {
            { fg = "#806d9c" },
            { fg = "#f35336" },
        },
        textobject = "ic",
        delay = 0,
    },
    indent = {
        enable = true,
        notity= true,
        chars = {
            "│",
        },
        delay = 0,
    },
    line_num = {
        enable = false,
    },
    blank = {
        enable = true,
        chars = {
            "·",
        },
        style = {
            { bg = "#434437" },
            { bg = "#2f4440" },
            { bg = "#433054" },
            { bg = "#284251" },
        },
    }
}

Expected behavior
Characters set in the blank char are displayed with the background color changed.

Screenshots
It appears as shown in the screenshot below.

Scrolling may show chars set to blank.

I just started using this plugin, so my settings could be wrong. If so, I would appreciate you pointing it out.