Error: Call to undefined function learn_press_get_education_themes()

Hi Learnpress! We have some problems with wp-cron background processes. We’re getting the following error in our website logs with Learnpress plugin after running wp-cron.php tasks with:
https://www.{ourwebsite}.com/wp-cron.php
or
https://www.{ourwebsite}.com/wp-cron.php?doing_wp_cron
Site health also report problems with background tasks that get stuck in that step:

PHP Fatal error: Uncaught Error: Call to undefined function learn_press_get_education_themes() in /{full_path}/wp-content/plugins/learnpress/inc/background-process/class-lp-background-query-items.php:285\nStack trace:\n#0 /{full_path}/wp-content/plugins/learnpress/inc/background-process/class-lp-background-query-items.php(56): LP_Background_Query_Items->query_related_themes()\n#1 /{full_path}/wp-content/plugins/learnpress/inc/libraries/wp-background-process.php(301): LP_Background_Query_Items->task(Array)\n#2 /{full_path}/wp-content/plugins/learnpress/inc/libraries/wp-background-process.php(445): WP_Background_Process->handle()\n#3 /{full_path}/wp-includes/class-wp-hook.php(287): WP_Background_Process->handle_cron_healthcheck()\n#4 /{full_path}/wp-includes/class-wp-hook.php(311): WP_Hook->apply_filters('', Array)\n#5 /{full_path}/wp-includes/plugin.php(544): WP_Hook->do_action(Array)\n#6 /{full_path}/wp-cron.php(138 in /{full_path}/wp-content/plugins/learnpress/inc/background-process/class-lp-background-query-items.php on line 285

Do you know what could be the problem?
We’ve checked previous topics like:

More information:
WP Version: 5.4
Learnpress Version: 3.2.6.7

Thanks!