Bottom border not shown when height = 1

[mxgrn]

Below is what I'm seeing with the following settings:

  {
    'nyngwang/NeoZoom.lua',
    config = function()
      require('neo-zoom').setup {
        winopts = {
          offset = {
            top = 0,
            left = 0,
            width = 1,
            height = 1,
          },
          border = 'rounded',
        },
      }
      vim.keymap.set('n', '<CR>', function() vim.cmd('NeoZoomToggle') end, { silent = true, nowait = true })
    end
  },

Any hints? Thanks in advance!