Turns out that this specific issue was caused by someone on the IT team who wasn’t very experienced with WordPress adding some code that they found on a poorly written WordPress blog that literally starts out with an unmarked example of what not to do.
According to the IT team, this line added to wp-config.php was apparently the cause of the issue:
define( 'CUSTOM_TAGS', true );
There are two morals to this story:
- Always read WordPress blogs critically and verify that what you are doing is really the BEST solution, not just a solution.
- Never assume that others will be careful about trusting random things they read on the internet. This includes WordPress blogs.
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