When updating StreamBuilder on WordPress.com to 0.12.1, I got the following PHP 8.4 deprecation warning:
Deprecated: Tumblr\StreamBuilder\StreamRankers\CappedPostRanker::__construct(): Optional parameter $debug declared before required parameter $panel_allow_ranking is implicitly treated as a required parameter in wp-content/lib/stream-builder/sun/vendor/automattic/stream-builder/lib/Tumblr/StreamBuilder/StreamRankers/CappedPostRanker.php on line 70
185493-ghe-Automattic/wpcom
It's not an error deprecation yet so there's time to fix it but I'm not sure what the implications are for breaking compatibility on the constructor for the CappedPostRanker.