Add PDF button broke classic editor

With the latest version of PDF.js Viewer and WordPress 5.5.7, the classic editor is broken, I can’t switch between visual and text, and other problems. Disabling the PDF.js Viewer plugin works fine again.

I see this in console.log

pdfjs-media-button.js?ver=2.1.4:4 Uncaught ReferenceError: acf is not defined
    at HTMLDocument.<anonymous> (pdfjs-media-button.js?ver=2.1.4:4)
    at i (jquery.js?ver=1.12.4-wp:2)
    at Object.fireWith [as resolveWith] (jquery.js?ver=1.12.4-wp:2)
    at Function.ready (jquery.js?ver=1.12.4-wp:2)
    at HTMLDocument.J (jquery.js?ver=1.12.4-wp:2)
(anónimo) @ pdfjs-media-button.js?ver=2.1.4:4
i @ jquery.js?ver=1.12.4-wp:2
fireWith @ jquery.js?ver=1.12.4-wp:2
ready @ jquery.js?ver=1.12.4-wp:2
J @ jquery.js?ver=1.12.4-wp:2

Thanks for this plugin!