On page Visual Editor showing only text with 5.5 WP update

Since updating to WP 5.5 my Visual Editor no longer works with GP on pages that use the disable Gutenberg plugin

The site stats are below.

WordPress Version: 5.5 ✔
WordPress Multisite: No
WordPress Memory Limit: 512M
WordPress Debug Mode: No
WordPress Debug Log: No
WordPress Script Debug Mode: No
WordPress Cron: Yes
WordPress Alternate Cron: No
Background tasks: Yes ✔

### Active Theme ###

GeneratePress Child: by MR - 0.1 ✔
GeneratePress (Parent): by Tom Usborne (https://tomusborne.com) - 2.4.2 ✔

### Active Plugins ###

Akismet Anti-Spam: by Automattic - 4.1.6 ✔
All In One SEO Pack Pro: by All in One SEO Team - 3.6.2 ✔
BackupBuddy: by iThemes - 8.6.1.0 ✔
Beaver Builder Plugin (Pro Version): by The Beaver Builder Team - 2.3.2.9 ✔
Disable Gutenberg: by Jeff Starr - 2.2 ✔
Easy Theme and Plugin Upgrades: by Chris Jean - 2.0.1 ✔
GP Premium: by Tom Usborne - 1.11.2 ✔
InfiniteWP - Client: by Revmakx - 1.9.4.6 ✔
Login No Captcha reCAPTCHA (Google): by Robert Peake - 1.6.10 ✔
My Calendar: by Joseph C Dolson - 3.2.6 ✔
Schema Pro: by Brainstorm Force - 2.1.2 ✔
Send E-mails with Mandrill: by Miller Media ( Matt Miller ) - 1.2.10 ✔
Smush Pro: by WPMU DEV - 3.6.3 ✔
Wordfence Security: by Wordfence - 7.4.10 ✔
WP fail2ban: by Charles Lecklider - 4.3.0.7 ✔
WPMU DEV Dashboard: by WPMU DEV - 4.9.4 ✔
WP Rocket: by WP Media - 3.6.3 ✔

### Web Server ###

Software: Apache

### PHP ###

Version: 7.3.21 ✔
Memory Limit: 512M
Maximum Execution Time: 30
Maximum File Upload Size: 512M
Maximum File Uploads: 20
Maximum Post Size: 64M
Maximum Input Variables: 1000
cURL Enabled: Yes (version 7.71.1)
OpenSSL: OpenSSL 1.1.1g 21 Apr 2020 (269488255)
Mcrypt Enabled: No
Mbstring Enabled: Yes
Loaded Extensions: Core, date, libxml, openssl, pcre, zlib, filter, hash, pcntl, readline, Reflection, SPL, session, standard, cgi-fcgi, bcmath, bz2, calendar, ctype, curl, dom, mbstring, fileinfo, ftp, gd, gettext, iconv, imap, intl, json, exif, mysqlnd, PDO, Phar, posix, SimpleXML, soap, sockets, sqlite3, tokenizer, xml, xmlwriter, xsl, zip, mysqli, pdo_mysql, pdo_sqlite, wddx, xmlreader, xmlrpc, imagick, redis, Zend OPcache

### MySQL ###

Version: 5.5.5 ✔
Database Character Set: latin1
Database Collation: latin1_swedish_ci