gopls builds a module for the host's GOOS/GOARCH only, so usages in files such as foo_windows.go were missing from Find Usages on macOS, and renaming left them behind, breaking the build for that platform. Those files of the searched modules are now resolved the way other modules are: each mention of the name in its own view (gopls builds one for the file's platform), added after gopls' answer and included in Rename.
Incoming Calls now also lists the callers found this way, in other modules and in build-constrained files: the declaration containing each call site.