For those who also have this issue.
Add following code at the bottom of application/views/quote_templates/pdf/InvoicePlane.php
?>
</div>
<htmlpagefooter name="footer">
<footer>
<?php _trans('quote'); ?> <?php echo $quote->quote_number; ?> - <?php _trans('page'); ?> {PAGENO} / {nbpg}
</footer>
</htmlpagefooter>
<sethtmlpagefooter name="defaultFooter" value="on" />
<!-- To use the template with page numbering, uncomment the following line -->
<!-- <sethtmlpagefooter name="footerWithPageNumbers" value="on" /> -->
</body>
</html>
application/views/invoice_templates/pdf/InvoicePlane.php
</div>
<htmlpagefooter name="footer">
<footer>
<?php _trans('invoice'); ?> <?php echo $invoice->invoice_number; ?> - <?php _trans('page'); ?> {PAGENO} / {nbpg}
</footer>
</htmlpagefooter>
<sethtmlpagefooter name="defaultFooter" value="on" />
<!-- To use the template with page numbering, uncomment the following line -->
<!-- <sethtmlpagefooter name="footerWithPageNumbers" value="on" /> -->
</body>
</html>
and last:
application/helpers/mpdf_helper.php
Take an extremely close look at the changes from the pull_request from naui. He made some changes in a couple of places in the mpdf_helper file
This solved the footer note (html) settng and is now back visbile on both my quotes and invoice pdf.