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I don't think there an easy or even a fix for this at least not by simply injecting OpenXML code.
Using the landscape shortcode for Word document will also have another issue: the page/section dimension might me different to the portrait page/section because the dimension is hardcoded in the shortcode.
In OpenXML, a new section has to contains height, width, etc. and as far as I know don't inherits elements, thus since footer is not defined in the section, it's not there in the end.
For instance, here is what the community contributed landscapes shortcode does for Word:
quarto-cli/src/resources/filters/quarto-post/landscape.lua
Lines 11 to 23 in d4125e4