I am using a fresh install of VS2022 (17.8.6) and ReSharper (2023.3.3). When editing a source file, the keyboard shortcut Ctrl + [, S does not behave as expected according to the docs. It should select the file currently being edited in the Solution Explorer. On my machine, all the command does is type a single 's' character into the editor.
Looking in Tools | Options... | Keyboard the shortcut is correctly bound to command SolutionExplorer.SyncWithActiveDocument.
I have also seen this problem in multiple previous versions of VS and ReSharper.