RSS Feed/News ErrorException: Fatal Error: Trait "Sabberworm\CSS\Position\Position" not found

[ENXF NET]

I just upgraded to XF 2.3.8 from XF 2.3.7. I'm seeing this error on severage pages now:

JSON:

ErrorException: Fatal Error: Trait "Sabberworm\CSS\Position\Position" not found
src/vendor/sabberworm/php-css-parser/src/CSSList/CSSList.php:35
Generated by: Unknown account
Jan 23, 2026 at 8:42 PM
Stack trace
#0 [internal function]: XF::handleFatalError()
#1 {main}

Request state
array(4) {
  ["url"] => string(18) "/register/register"
  ["referrer"] => string(25) "https://mydomain.com/register/"...

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