Caching information is only collected when the entryIdentifier contains a "format = 'html'", uncached elements do not contain a 'format' in the entryIdentifier, this is only mandatory for 'cached' or 'dynamic'.
Offending lines:
// Add debug data only to html output
$segmentFormat = $info['entryIdentifier']['format'] ?? null;
if ($segmentFormat !== 'html') {
return $segment;
}
See commit: b46cc51