Updated Nimble Builder breaks RSS

I’m stuck on version 3.1.32. Whenever I upgrade, my RSS feed breaks. I host a podcast on the site, so RSS is critica.

Cast Feed Validator gives me this:

Successfully completed feed download tests.
X FATAL: Error parsing XML. is invalid XML, likely due to invalid characters. XML error: > required at line 68, column 121. Did not finish feed tests.

Reverting back to version 3.1.32 fixes this problem.

### Begin System Info (Generated 2022-08-11 19:36:22) ###
------------ SITE INFO
Site URL:                 https://www.echozoe.com
Home URL:                 https://www.echozoe.com
Multisite:                No

------------ USER BROWSER
Platform:                 Apple 
Browser Name:             Chrome  
Browser Version:          104.0.0.0 

------------ WORDPRESS CONFIG
WP Version:               6.0.1
Language:                 en_US
Permalink Structure:      /archives/%post_id%
Active Theme:             Customizr Pro 2.4.22
Show On Front:            posts
ABSPATH:                  /home4/echozoen/public_html/blog/
WP_DEBUG:                 Disabled
WP Memory Limit:          40MB

------------ NIMBLE CONFIGURATION
Version:                  3.1.32
Upgraded From:            3.3.1
Started With:             1.8.16

------------ MU PLUGINS
backtrace-errors.php: 
SSO: 0.4

------------ WP ACTIVE PLUGINS
Blubrry PowerPress: 9.1.4
Classic Editor: 1.6.2
Contact Form 7: 5.6.2
Database Backup for WordPress: 2.5.2
Google Authenticator: 0.54
Nimble Page Builder: 3.1.32 (needs update - 3.3.1)
Pretty Links Blogger Edition: 3.2.4
Really Simple CAPTCHA: 2.1
Really Simple SSL: 5.3.3
RefTagger: 2.4.4
SiteAlert (Formerly WP Health): 1.9.7
SQRL Login: 2.1.0

------------ WP INACTIVE PLUGINS
WP-Optimize - Clean, Compress, Cache: 3.2.6

------------ WEBSERVER CONFIG
PHP Version:              8.0.18
MySQL Version:            5.7.23
Webserver Info:           Apache
Write/Read permissions:   OK

------------ PHP CONFIG
Memory Limit:             512M
Upload Max Size:          512M
Post Max Size:            516M
Upload Max Filesize:      512M
Time Limit:               60
Max Input Vars:           1000
Display Errors:           N/A
PHP Arg Separator:        &
PHP Allow URL File Open:  1

### End System Info ###