XenForo data-xf-init="tooltip"

[Nicolas FR]

Hello, If in an HTML link I use data-xf-init="tooltip" the title tag turns into a data-original-title tag when the code is browsed by robots causing an accessibility warning. What is it due to? Am I using data-xf-init="tooltip" wrong?
Thanks.

My code
HTML:

<div class="fp-Social">
    <a href="{$xf.options.footerProSocial_link1}" data-xf-init="tooltip" title="{$xf.options.footerProSocial_icon1}" target="_blank"><i class="fab fa-{$xf.options.footerProSocial_icon1}...

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