CachedMemoizeFunctions error

Hi,
if I update version 8.4.1 to a later one, WordPress sends me the site malfunction email with the following wording:

Plugin corrente: SEOPress (versione 8.5.1.1)
Versione PHP 8.1.31

Dettagli dell'errore
====================
Un errore di E_ERROR è stato causato nella linea 19 del file /home/t478o0up/public_html/wp-content/plugins/wp-seopress/src/Helpers/CachedMemoizeFunctions.php. Messaggio di errore: Uncaught TypeError: call_user_func_array(): Argument #1 ($callback) must be a valid callback, function "seopress_get_dynamic_variables" not found or invalid function name in /home/t478o0up/public_html/wp-content/plugins/wp-seopress/src/Helpers/CachedMemoizeFunctions.php:19
Stack trace:
#0 /home/t478o0up/public_html/wp-content/plugins/wp-seopress/src/Helpers/CachedMemoizeFunctions.php(19): call_user_func_array()
#1 /home/t478o0up/public_html/wp-content/plugins/wp-seopress/seopress.php(223): SEOPress\Helpers\CachedMemoizeFunctions::SEOPress\Helpers\{closure}()
#2 /home/t478o0up/public_html/wp-includes/class-wp-hook.php(324): seopress_dyn_variables_init()
#3 /home/t478o0up/public_html/wp-includes/plugin.php(205): WP_Hook->apply_filters()
#4 /home/t478o0up/public_html/wp-content/plugins/wp-seopress/inc/functions/options-titles-metas.php(12): apply_filters()
#5 /home/t478o0up/public_html/wp-includes/class-wp-hook.php(324): seopress_titles_the_title()
#6 /home/t478o0up/public_html/wp-includes/plugin.php(205): WP_Hook->apply_filters()
#7 /home/t478o0up/public_html/wp-includes/general-template.php(1188): apply_filters()
#8 /home/t478o0up/public_html/wp-includes/general-template.php(1311): wp_get_document_title()
#9 /home/t478o0up/public_html/wp-includes/class-wp-hook.php(324): _wp_render_title_tag()
#10 /home/t478o0up/public_html/wp-includes/class-wp-hook.php(348): WP_Hook->apply_filters()
#11 /home/t478o0up/public_html/wp-includes/plugin.php(517): WP_Hook->do_action()
#12 /home/t478o0up/public_html/wp-includes/general-template.php(3064): do_action()
#13 /home/t478o0up/public_html/wp-content/themes/ctheme/404.php(6): wp_head()
#14 /home/t478o0up/public_html/wp-content/plugins/wp-cerber/cerber-load.php(4635): include('/home/t478o0up/...')
#15 /home/t478o0up/public_html/wp-content/plugins/wp-cerber/cerber-load.php(2448): cerber_404_page()
#16 /home/t478o0up/public_html/wp-content/plugins/wp-cerber/cerber-load.php(2411): cerber_access_control()
#17 /home/t478o0up/public_html/wp-includes/class-wp-hook.php(324): {closure}()
#18 /home/t478o0up/public_html/wp-includes/class-wp-hook.php(348): WP_Hook->apply_filters()
#19 /home/t478o0up/public_html/wp-includes/plugin.php(517): WP_Hook->do_action()
#20 /home/t478o0up/public_html/wp-settings.php(704): do_action()
#21 /home/t478o0up/public_html/wp-config.php(80): require_once('/home/t478o0up/...')
#22 /home/t478o0up/public_html/wp-load.php(50): require_once('/home/t478o0up/...')
#23 /home/t478o0up/public_html/wp-login.php(12): require('/home/t478o0up/...')
#24 {main}
  thrown

can you help me understand what is causing it?
Thanks