3.1.1.1 suddenly breaks admin access

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Autoptimize suddenly broke my access to wp admin, I got the following error – only renaming the plugin via FTP helped. Can you help here what is going on?

Aktives Theme: NisargPRO Child (Version 1.0.0) Aktuelles Plugin: Autoptimize (Version 3.1.1.1) PHP-Version 8.0.22

Ein Fehler vom Typ E_ERROR wurde in der Zeile 41 der Datei /wp-content/plugins/autoptimize/classes/autoptimizeCriticalCSSSettings.php verursacht. Fehlermeldung: Uncaught Error: Class "autoptimizeCriticalCSSSettingsAjax" not found in /wp-content/plugins/autoptimize/classes/autoptimizeCriticalCSSSettings.php:41
Stack trace:
#0 /wp-content/plugins/autoptimize/classes/autoptimizeCriticalCSSSettings.php(21): autoptimizeCriticalCSSSettings->run()
#1 /wp-content/plugins/autoptimize/classes/autoptimizeCriticalCSSBase.php(152): autoptimizeCriticalCSSSettings->__construct()
#2 /wp-content/plugins/autoptimize/classes/autoptimizeMain.php(244): autoptimizeCriticalCSSBase->load_requires()
#3 /wp-includes/class-wp-hook.php(307): autoptimizeMain->maybe_run_criticalcss('')
#4 /wp-includes/class-wp-hook.php(331): WP_Hook->apply_filters(NULL, Array)
#5 /wp-includes/plugin.php(476): WP_Hook->do_action(Array)
#6 /wp-content/plugins/autoptimize/classes/autoptimizeMain.php(155): do_action('autoptimize_set...')
#7 /wp-includes/class-wp-hook.php(307): autoptimizeMain->setup('')
#8 /wp-includes/class-wp-hook.php(331): WP_Hook->apply_filters(NULL, Array)
#9 /wp-includes/plugin.php(476): WP_Hook->do_action(Array)
#10 /wp-settings.php(461): do_action('plugins_loaded')
#11 /wp-config.php(101): require_once('/home/htdocs/u4...')
#12 /wp-load.php(50): require_once('/home/htdocs/u4...')
#13 /wp-admin/admin.php(34): require_once('/home/htdocs/u4...')
#14 /wp-admin/index.php(10): require_once('/home/htdocs/u4...')
#15 {main}
  thrown

 

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