Steps to reproduce.
Create a new workbook, print it and then save it in Excel as xlsx. When you try to read this xlsx file with the exceljs package, the following error is thrown:

Error: Unexpected xml node in parseOpen: {"name":"cp:lastPrinted","attributes":{},"isSelfClosing":false}
at [object Object].utils.inherits.parseOpen (/home/gt-st-admin/www/admin-backend/node_modules/exceljs/lib/xlsx/xform/core/core-xform.js:99:17)
at SAXStream. (/home/gt-st-admin/www/admin-backend/node_modules/exceljs/lib/xlsx/xform/base-xform.js:65:14)
at emitOne (events.js:90:13)
at SAXStream.emit (events.js:182:7)
at Object.me._parser.(anonymous function) as onopentag
at emit (/home/gt-st-admin/www/admin-backend/node_modules/exceljs/node_modules/sax/lib/sax.js:615:33)
at emitNode (/home/gt-st-admin/www/admin-backend/node_modules/exceljs/node_modules/sax/lib/sax.js:620:3)
at openTag (/home/gt-st-admin/www/admin-backend/node_modules/exceljs/node_modules/sax/lib/sax.js:801:3)
at Object.write (/home/gt-st-admin/www/admin-backend/node_modules/exceljs/node_modules/sax/lib/sax.js:1169:26)
at SAXStream.write (/home/gt-st-admin/www/admin-backend/node_modules/exceljs/node_modules/sax/lib/sax.js:227:16)
at Entry.ondata (_stream_readable.js:536:20)
at emitOne (events.js:90:13)
at Entry.emit (events.js:182:7)
at readableAddChunk (_stream_readable.js:153:18)
at Entry.Readable.push (_stream_readable.js:111:10)
at Entry.Transform.push (_stream_transform.js:128:32)

Attached test-last-printed.xlsx is a sample file to reproduce the issue.