Show More/Show Less Not Working After Upgrade to 5.5.3

Hello,

After upgrading WordPress to 5.5.3, my “show more text/show less” feature is not working. Currently, the html code shows up in the text body. All of my plugins have been updated. Here is the code that previously worked:

[show_more more=”Continue reading” less=”Show less” color=”#0066cc” list=”?”][/show_more]

Any advice on how to get this feature to work?

The page I need help with: [log in to see the link]