test_expect_success 'can see submodule diffs after independed cloning' \
'(cd fully_cloned_submodule/main && git diff --submodule master"^!" | grep "file1 updated")'
+test_expect_success 'checkout sub manually' \
+ 'mkdir linked_submodule &&
+ (cd clone/main &&
+ git worktree add "$base_path/linked_submodule/main" "$rev1_hash_main") &&
+ (cd clone/main/sub &&
+ git worktree add "$base_path/linked_submodule/main/sub" "$rev1_hash_sub")'
+
+test_expect_success 'can see submodule diffs after manual checkout of linked submodule' \
+ '(cd linked_submodule/main && git diff --submodule master"^!" | grep "file1 updated")'
+
test_done