Whew what a day! Got tired of waiting for the ppa.setup-php.com mirror to pick up the PHP2Shell fixes for my Forge box, so I pointed apt straight at packages.sury.org instead. 8.4.27 and 8.5.12 installed, FPM restarted, done.
GitHubGitHub - shivammathur/setup-php: GitHub action to set up PHP with extensions, php.ini configuration, coverage drivers, and various tools.GitHub action to set up PHP with extensions, php.ini configuration, coverage drivers, and various tools. - shivammathur/setup-php
commit 92328b3