Why footnotes are not preserved in the target file generated in Trados Studio 2019 when the sdllxiff was created in Trados Studio 2021?
If the target is generated from Trados Studio 2021 the footnotes are present, also if you open a 2019 sdlxliff in 2021. Only for the sdlxliff created in Trados Studio 2021 and translated in 2019, the target does not contain any footnotes.