glossaries-extra package FAQ
Make sure you set the abbreviation style before the relevant
\GlsXtrLoadResources. Also check the abbreviation definition in the .glstex file. Has the
category field been set? Does the helper command provided to define the abbreviation (such as
\bibglsnewabbreviation) set the
category field? Check that the category matches the optional argument of
\setabbreviationstyle. Remember that spaces are significant (including those created by the end of line character) and should be stripped from the category label.
Alternative link: https://www.dickimaw-books.com/faq.php?itemlabel=bib2glssetabbrvstyle