Fatal error on admin dashboard

Hello everyone,

We use a multilingual website supporting English (US), Bulgarian and English (UK). The website and more specifically the administrative dashboard works without any problems when one of the two English language options is selected, but when the Bulgarian language is selected we receive the following error message:

Error Details
=============
An error of type E_ERROR was caused in line 20 of the file /home/rcci/public_html/wp-content/plugins/the-events-calendar/src/Tribe/Admin/Bar/Default_Configurator.php. Error message: Uncaught ValueError: Unknown format specifier " " in /home/rcci/public_html/wp-content/plugins/the-events-calendar/src/Tribe/Admin/Bar/Default_Configurator.php:20
Stack trace:
#0 /home/rcci/public_html/wp-content/plugins/the-events-calendar/src/Tribe/Admin/Bar/Default_Configurator.php(20): sprintf('%\xD1\x81', '\xD1\x81\xD1\x8A\xD0\xB1\xD0\xB8\xD1\x82\xD0\xB8\xD1\x8F')
#1 /home/rcci/public_html/wp-content/plugins/the-events-calendar/src/Tribe/Admin/Bar/Admin_Bar.php(66): Tribe__Events__Admin__Bar__Default_Configurator->configure(Object(WP_Admin_Bar))
#2 /home/rcci/public_html/wp-content/plugins/the-events-calendar/src/Tribe/Main.php(3602): Tribe__Events__Admin__Bar__Admin_Bar->init(Object(WP_Admin_Bar))
#3 /home/rcci/public_html/wp-includes/class-wp-hook.php(307): Tribe__Events__Main->add_toolbar_items('')
#4 /home/rcci/public_html/wp-includes/class-wp-hook.php(331): WP_Hook->apply_filters(NULL, Array)
#5 /home/rcci/public_html/wp-includes/plugin.php(476): WP_Hook->do_action(Array)
#6 /home/rcci/public_html/wp-includes/admin-bar.php(102): do_action('wp_before_admin...')
#7 /home/rcci/public_html/wp-includes/class-wp-hook.php(307): wp_admin_bar_render('')
#8 /home/rcci/public_html/wp-includes/class-wp-hook.php(331): WP_Hook->apply_filters('', Array)
#9 /home/rcci/public_html/wp-includes/plugin.php(476): WP_Hook->do_action(Array)
#10 /home/rcci/public_html/wp-admin/admin-header.php(267): do_action('in_admin_header')
#11 /home/rcci/public_html/wp-admin/index.php(137): require_once('/home/rcci/publ...')
#12 {main}
  thrown

We use the following server and WordPress configuration:

HostName: rcci.bg
cURL Version: 7.85.0
OpenSSL Version: OpenSSL/1.1.1q
OS: Linux vps.rapsource.net 3.10.0-1127.13.1.el7.x86_64 #1 SMP Tue Jun 23 15:46:38 UTC 2020 x86_64
PHP: Linux 8.0.24 C
PHP Dependencies: iconv=Yes, spl_autoload=Yes, openssl=Yes, sockets=Yes, allow_url_fopen=Yes, mcrypt=No, zlib_encode=Yes
WordPress: 6.0.2 en_US UTF-8
WordPress Theme: Kadence Child
WordPress Plugins: Advanced Custom Fields, Akismet Anti-Spam, iThemes Security, Custom Post Type UI, Duplicate Page, The Events Calendar: Virtual Events, Kadence Blocks - PRO Extension, Kadence Blocks – Gutenberg Blocks for Page Builder Features, Kadence Conversions - Popups, slide-ins, Kadence Custom Fonts, Kadence Pro - Premium addon for the Kadence Theme, Loco Translate, OneSignal Push Notifications, Post SMTP, Post Types Order, Redirection, SearchWP, Rank Math SEO, Simple Blog Stats, The Events Calendar, TranslatePress - Business, TranslatePress - Multilingual, UpdraftPlus - Backup/Restore, URL Shortify, User Role Editor, Asset CleanUp Pro: Page Speed Booster, WP Rocket

I am asking for your assistance in fixing the problem.

Regards,
Svetoslav