Created attachment 106476 [details] useless feedback. I am on KDE neon, and this might be related to KFramework or Qt dependancies doing weird things, the real reason I am reporting this is that the reasons window is completely and utterly useless in this case. I cannot figure out which package it is, I cannot figure out what is causing it, there's no hint whatsoever.
Some more research: Ora files do load correctly. So do pngs, jpegs, etc. Similarly, when I add to "KisImportExportManager::doImport" two debug statements around KisImportExportFilter::ConversionStatus status = filter->convert(m_document, &file, KisPropertiesConfigurationSP()); I get those debug statements, but when I add debug statements to KraImport::convert(), they don't show up. If this is a dependancy bug, I am worried it's not a temporary one.
Fixed in https://commits.kde.org/krita/d035758547f18d875a9a9fba3eea6cd1362aed3d
Thanks for fixing this issue :)