When viewing the citations for a contributor using the Contributor view (bibcite_contributor) if using PHP 8.1, several PHP deprecation warnings are displayed if error reporting all is enabled:
Deprecated function: implode(): Passing null to parameter #1 ($separator) of type array|string is deprecated....
Set PHP to 8.1 and set error reporting to all messages, enable the module and add one or more citations for a contributor then use the view to display them.
I don't know how update the academicpuma/citeproc-php library and there is another issue addressing that it is abandoned. But if a site is using cweagans/composer-patches, then the attached patch can be applied to the library by composer with
"academicpuma/citeproc-php": {
"PHP 8.1 compatibility fix": "patches/cite-php-implode-php81.patch"
},
I don't know if it would be appropriate to put the composer-patches and patch into the module composer.json.
Drupal's caches need to be cleared after applying the patch to see the difference.
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It's likely this issue predates Contrib.social: some issue and comment data are missing.
The library academicpuma/citeproc-php is abandoned. This is fixed in dev version to https://packagist.org/packages/seboettg/citeproc-php
I applied this patch to our Drupal 9 instance and it solved the implode() function errors.