In-compatible with WordPress 5.5

Hi WP SMTP SUPPORT TEAM,

Fatal error: Uncaught Error: Class ‘PHPMailer\PHPMailer\SMTP’ not found in /var/www/wp-includes/PHPMailer/PHPMailer.php:1821 Stack trace: #0 /var/www/wp-includes/PHPMailer/PHPMailer.php(1942): PHPMailer\PHPMailer\PHPMailer->getSMTPInstance() #1 /var/www/wp-includes/PHPMailer/PHPMailer.php(1858): PHPMailer\PHPMailer\PHPMailer->smtpConnect(Array) #2 /var/www/wp-includes/PHPMailer/PHPMailer.php(1601): PHPMailer\PHPMailer\PHPMailer->smtpSend(‘Date: Wed, 8 Ju…’, ‘\t\t<!doctype htm…’) #3 /var/www/wp-content/plugins/wp-mail-smtp/src/MailCatcher.php(88): PHPMailer\PHPMailer\PHPMailer->postSend() #4 /var/www/wp-includes/pluggable.php(494): WPMailSMTP\MailCatcher->send() #5 /var/www/wp-content/plugins/wp-mail-smtp/src/Admin/Pages/TestTab.php(172): wp_mail(Array, ‘WP Mail SMTP: H…’, ‘\t\t<!doctype htm…’, Array) #6 /var/www/wp-content/plugins/wp-mail-smtp/src/Admin/Area.php(773): WPMailSMTP\Admin\Pages\TestTab->process_post(Array) #7 /var/www/wp-includes/class-wp-hook.php(287): WPMailSMTP\Admin\Area->process_actions(”) #8 /v in /var/www/wp-includes/PHPMailer/PHPMailer.php on line 1821

External Library updates in WordPress 5.5: call for testing

How to reproduce :
Install WP SMTP
Install WordPress Beta Tester plugin (choose the “bleeding edge nightlies” option) for WordPress 5.5 beta 1
Create a post and comment or Try to send a SMTP test from setting page.
Here you could see above mentioned error

With regards,
Ugyen