I also can't get Sigil to crash using your steps (on Windows). For either obfuscation scheme. Can you give a more precise example of what you're changing the dc:identifier from, and what you're changing it to?
For what it's worth, changing the dc:identifier is definitely a no-no where Adobe's font obfuscation scheme is concerned. Not without reapplying the obfuscation afterward, anyway. It will render the fonts unusable in the epub. But it shouldn't crash Sigil.
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