This reverts #124938 & #124827, leaving File Browser as it was before, without any extra ED_fileselect_set_params_from_userdef to ensure that the previous_dir is populated with current directory. I have not found a place to ensure this history is correct (when File Browser is part of the layout) that does not cause unintended consequences. Will mark the original bug report, #124771, as unresolved. Pull Request: https://projects.blender.org/blender/blender/pulls/125019