Missing argument 1 for mfn_title() error in title attribute when using child theme

After upgrading to 13.9 I get the following text in my page and post title attributes:

<br /> <b>Warning</b>:  Missing argument 1 for mfn_title(), called in /[siteroot]/wp-content/themes/betheme-child/header.php on line 26 and defined in <b>/[siteroot]/wp-content/themes/betheme/functions/theme-head.php</b> on line <b>16</b><br /> ["page/post" title]

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