Both Evolution 3.35 and F32 are unreleased software. Looks like you'reusing a testing release, in which case you should ask on the FedoraTest list, not here.
[lesca@dodo tmp]$ grep TNEF evolution-3.34.1-1.fc31.src/evolution.spec
-DENABLE_YTNEF=OFF \
the PST importer and disable the experimental TNEF attachments plugin
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