Blocking outgoing packages on a port

Dear NETGEAR community,

I run the M4300-52G-PoE+ ProSAFE on the latest firmware version "12.0.11.13" in a very minimalistic configuration:

• There exists only one VLAN 1 where all ports are assigned to (plus one configuration VLAN 2)
• All features of the M4300 are turned off, so it actually acts as a common unmanaged switch
• 3 devices are attached to VLAN 1
  • Port 50: Uplink
    
  • Port 14: PC1 (device with MAC address "22:A8:2E:21:CA:1C")
  • Port 3: PC2

My goal is as follows:

• PC1 and PC2 are allowed to communicate
• PC2 and Uplink are allowed to communicate
• PC1 and Uplink are not allowed to communicate (Any package from PC1 may not leave Uplink)

My current approach:

I though of configuring an ACL as in the attached image. But as soon as I apply the rule, all communication over Uplink is blocked. Am I missing something or do I misuse ACL? It would be nice if some could clearify my issue or at least give a hint, how I can accomplish my goal.

Kind regards