Describe the bug

Following an upgrade to rc28 our table headers have disappeared.

Steps to reproduce the bug

Most of our usage uses stacked="md" If I remove the attribute the table headers then show as expected.

    <b-table
      id="contractsTable"
      ref="table"
      :items="$_tableProvider"
      :fields="fields"
      :current-page="currentPage"
      :per-page="perPage"
      :filter="filter"
      :api-url="apiUrl"
      stacked="md"
      show-empty
      striped
      no-local-sorting
      no-local-filtering
    >

Expected behavior

What it looks like without the stacked attribute.

Versions

Libraries:

• BootstrapVue: 2.0.0-rc28
• Bootstrap: 4.3.1
• Vue: 2.6.10

Environment:

• Device: PC
• OS: Debian Linux (buster)
• Browser: Chrome
• Version: 76.0.3809.100 (Official Build) (64-bit)