I think it's definitely a package problem. It crashes immediately for me -- with almost no output. But when I build Sigil myself (using the exact same system Qt5 version and system glibc), it runs fine.
I use the bundled subprojects that we include in Sigil's source (prce2, minzip, etc) when building, so I guess it could technically be one of those system libraries that their package de-bundles but I doubt it.
New Sigil maintainer over there, so I'll let their in-house bug system protocols play out a bit.
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