GS110EMX VLAN features not working

In my prior post here I described an issue I'm having with my GS110EMX, which is not tagging frames on a trunked interface despite an apparently valid configuration. This switch is running 

Yesterday, reading the documentation of another vendor's switch, I came on a setting on that device where the switch did not tag frames if the vlan matched the port's PVID. Given that at the time (our teenager was in the middle of an intense online game), I decided to test this with a new VLAN.

The setup (screenshots below) is as follows:

Port 2 untagged on VLAN 10, PVID set to 10

Ports 1-6, 9, 10 untagged on VLAN 2, PVID set to 2

Ports 7/8 (LAG 1, LACP) tagged on VLANS 2 and 10, PVID set to 2.

I plugged my laptop into Port 2, and ran several packet captures from both my client and the upstream router (a Mikrotik RB5009) during my testing. Some interesting (and maddening) results came from this:

• Traffic from untagged VLAN 2 ports appeared up the upstream router untagged, as previously observed.
• Broadcast DHCP requests from my laptop did not appear on the upstream router, at all. No traffic tagged with VLAN 10 was seen (caveat: I did not test the forwarding of non-broadcast traffic sent from my laptop into port 2 using a static IP configuration on the DHCP client).

Attached below is a series of screenshots showing the configuration and the resulting PCAPs. Is there anything I'm missing, or is this a failure of the switch hardware itself? And yes, I did powercycle it to make sure that wouldn't change anything.

GS110EMX configuration:

LACP configuration for LAG 1 on Ports 7-8:

LAG 1 Enabled and set to LACP

Ports 7,8 assigned to LAG 1

LACP System Priority set to default 32768

LACP Priority and Timeout set to default 128/Long

801.Q Configuration:

Basic Port-Based VLAN Status disabled

Basic 802.1Q VLAN Status disabled

802.1Q Configuration:

VLAN Configuration showing VLAN membership status for all VLANs: VLAN 1 with no port members; VLAN 2 with all ports as members, VLAN 10 with ports 2,7-8 as members.

VLAN Membership for VLAN 2 - Ports 1,3-6,9-10 untagged, Ports 7-8 (LAG 1) tagged

VLAN Membership for VLAN 10 - Port 2 untagged, Ports 7/8 (LAG 1) tagged

Port PVID configuration: Port 2 PVID set to 10, all others set to 2

Client sending broadcast DHCP Discover requests to untagged Port 2. These packets did not appear in a pcap on the upstream router running at the same time.