Composer patches cweagans Core module update syntax – one patch not being applied

I’m using cweagans composer patches:
to patch Drupal 9.x
I’ve made a patch file. The first patch applies but I think I have the path wrong for the core module, layout_builder, which I am trying to patch. Patch file below. The patch seems to be completely ignored. Layout Builder patch is applied to: core/modules/layout_builder/src/Form/OverridesEntityForm.php

   "patches": {
     "drupal/imce": {
         "Secuirty isued D9 imcefilefield": ""
     "core/layout_builder": {
         "Default region for overridden layout of entity": ""