WP Syntax highlighter plugin not working anymore in ALB

For some reason WP Syntax highlighter plugin v3.7.0 has stopped working in in ALB in WP v6.5.4. The plugin does work on other pages that don’t use ALB, but the problem pages don’t allow for switching between default and advanced editor anymore. Here’s an example (scroll down to de code section): FIR arbitrary magnitude response filter - ASN Home

Any help appreciated!
-Sanjeev.