Lingo uses DOMDocument to parse HTML. DOMDocument is kind of noisy for HTML5 and, as a result, the call to DOMDocument::loadHTML is surrounded by AtEase::suppressWarnings().

This doesn't stop backtraces from showing up in the debug log, though.

The "right" solution is to probably use Dom\HTMLDocument which is available in PHP 8+, But, following a suggestion in the comments on the documentation, I found that using LIBXML_NOERROR does the job as well.