Why converting xlsx to xls feature ignore hide grid checkmark?

i’m using console comand
C ""C:\Program Files (x86)\LibreOffice\program\soffice.bin" --norestore --nofirststartwizard --headless --convert-to xls "C:\AlphaStorage\mpt\mptStorage\File.ConvertedFile\1d9a404b-a859-41cc-b7c3-8658532e8458\Паспорт государственной программы 26.08.2020 15.31.xlsx" --outdir "C:\AlphaStorage\mpt\mptStorage\File.ConvertedFile\1d9a404b-a859-41cc-b7c3-8658532e8458"" for conver xlsx file with hidden grid to xls. But, after converting my file haven’t hidden grid.
If i’m using interface and just pick “save us” button, file has normal converting, saved my checkmark. May be i need use any flag or options?

That would be a bug. Please file it, with a sample XLSX.

(A tip: there’s https://forumooo.ru, and also LibreOfficeRU telegram channel)