RSTP and LACP – Configuring RSTP and LACP, Handling Topology Changes

I am having trouble with configuring LACP and RSTP on a (TPLINK TL-SG3424) switch. If I reboot the VM Server or unplug one of the LACP ports it causes a RSTP topology change that pauses packet forwarding on the swtich for around ~6 seconds. (E.g I can't reach the internet from PC).

Interestingly if I unplug my PC it has no effect whatsoever on anything connected to the switch.

I am wondering what can be wrong because it seems not to be working right. I wouldn't expect to see a topology change if I unplug a LACP port.

My setup:

         ((internet))
              |
              | WAN
              | 
        (Mikrotik ROUTER)  
              | 10.10.10.1/24  (router is selected as root bridge)
              | LAN
              | Port 2
        (TL-SG3424 SWITCH) 
    Port 4 |          || LACP
           |          || Port 10,12
           |          ||
          (PC)    (VM SERVER - proxmox)
  10.10.10.2/24     10.10.10.3/24

A mikrotik router is connected to the internet via the WAN port. The LAN ports run RSTP and I have set a priority of 0 to ensure it is selected as the root bridge.

I have enabled RSTP on all the ports of the switch (TPLINK TL-SG3424).
Following the TPLINK user guide, I have set the following stp security features on the switch ports:

Stp summary:

The network configuration on the VM server is set to this:

auto lo
iface lo inet loopback

iface eth0 inet manual

iface eth1 inet manual

auto bond0
iface bond0 inet manual
        slaves eth0 eth1
        bond_miimon 100
        bond_mode 802.3ad

auto vmbr0
iface vmbr0 inet static
        address  10.10.10.3
        netmask  255.255.255.0
        gateway  10.10.10.1
        bridge_ports bond0
        bridge_stp off
        bridge_fd 0