Go to the BP_StickResourceFoliageComponent and make sure the collision settings are set like the image below, then compile and save the blueprint.

Then go to the BushResourceDemo and set the collision settings like the image below.

Next go to the BP_BushResource then select the Resource Mesh and copy the collision settings below.

Then go to the BP_MasterResource and select the highlighted nodes from the image and delete them.

Next replace the deleted nodes with the highlighted node shown in the image below, make sure you set the New Type to Collision Enabled.

Next delete the highlighted node from the image below.

Then replace the deleted node with the node shown below. Make sure you set the New Type to No Collision

Next go to the area of code shown below and make the code in your project look like the image, make sure you set the New Types on both nodes.