Assuming a file with a wrong name extension (quite often .xls instead of .csv), menu:File>Properties guesses the file type by name extension whereas menu:File>Save As... indicates the actual file type that has been detected when loading the file.
Also repro using OOo 3.2.0.
Code pointer: sfx2/source/dialog/dinfdlg.cxx, function SfxDocumentPage::Reset, the relevant label is represented by m_xShowTypeFT.
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Issue reproducible in: Version: 25.8.0.0.alpha1 (X86_64) / LibreOffice Community Build ID: a2896e060b54ce6ce36e3e29218fac40d2919c74 CPU threads: 4; OS: Linux 5.15; UI render: default; VCL: gtk3 Locale: de-DE (de_DE.UTF-8); UI: en-US Calc: threaded