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Command \MakeUppercase does not work as expected in pdfLatex, but works fine in LuaLaTeX and XeLaTeX

The next expl3 update will address this: see https://github.com/latex3/latex3/commit/2b91cfa676bf2a99fbfab63537b9e0bdcb612880 for the code detail. The approach is to use a simplified method for ...
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How to remove accents when using \MakeUppercase for Greek?

The \uppercase primitive uses \lccode of each character to create the uppercase variant. So, you can set \uccode of all accented variants as their non-accented counterparts. For example in OpTeX: \...
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How to remove accents when using \MakeUppercase for Greek?

Just add \usepackage[greek]{babel}, preferably after fontspec package, in the preamble, it resolves the problem.
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Command \MakeUppercase does not work as expected in pdfLatex, but works fine in LuaLaTeX and XeLaTeX

Note \MakeUppercase had a big upgrade in the June2022 release, this applies to the current release mostly. The Unicode data files show accented letters as uppercase, which doesn't always match what is ...
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