en:Special:Version says 1.38.0-alpha (aeea3a5) 13:11, 22 February 2022 (aeea3a582). That's about twenty revisions behind HEAD (6a85933fd at the time of writing this). /srv/mediawiki-staging/php-master on deployment-deploy03 is at ceb10546c5 (about 17 revisions behind), so it's not (or not purely) a sync issue like T300591: Beta cluster MediaWiki code not updating was.
The Jenkins build queue GUI complains about executor starvation. There were neither successful not failed beta job runs in the last 13 hours. Someone more familiar with Jenkins will have to look at this.
/srv/mediawiki-staging/php-master on deployment-deploy03 looks up to date now when I compare to a local pull of mediawiki-core. Maybe this has been fixed by some kind soul or has fixed itself?