Toggle doesnt work properly on Aqara T2 Gu10 when grouped

What happened?

Hi, ive bought 27 aqara T2 gu10 bulbs (lumi.light.agl005) to use in my smarthome with switches in detached mode. Unfortunately they dont work properly when grouped, on/off works just fine, but toggle is very slow and unreliable. Ive tried almost anything and nothing worked, including:

• tried on both firmware versions 30 and 31
• tried reflashing firmware to thread, then back to zigbee
• tried removing and adding device back to zigbee network
• tried removing and creating groups containing the bulb
• everything was tried on newest z2m, ha versions available atm

versions:
z2m:  2.13.0-1
HA: Core: 2026.8.3
HA: Supervisor2026.08.0
HA: Operating System18.2
HA: Frontend20260729.7 · legacy
aqara t2 gu10: 31

Ive also recorded a video showing whats wrong:
https://www.youtube.com/watch?v=pljEio3J8-E

What did you expect to happen?

T2 Bulb in group would toggle just fine

How to reproduce it (minimal and precise)

Create a group, add the bulb to it (tried with group containing one and many bulbs), send {"state": "toggle"} to the group

Zigbee2MQTT version

2.13.0-1

Adapter firmware version

EmberZNet 7.5.1 [GA]

Adapter

Home Assistant Connect ZBT-2

Setup

I run it in a virtualbox vm on my mac m3

Device database.db entry

{"id":17,"type":"Router","ieeeAddr":"0x54ef441001296748","nwkAddr":6810,"manufId":4447,"manufName":"Aqara","powerSource":"Mains (single phase)","modelId":"lumi.light.agl005","epList":[1,21],"endpoints":{"1":{"profId":260,"epId":1,"devId":258,"inClusterList":[5,4,3,0,768,8,6,2820,1794,64704],"outClusterList":[25,10],"clusters":{"genBasic":{"attributes":{"61441":1,"modelId":"lumi.light.agl005","appVersion":31}},"manuSpecificLumi":{"attributes":{"22":"3F2EB22159BF8155B6CD72BD8EDC1EA2589962078A72AD8E5AD0CE13311F43BE","223":{"type":"Buffer","data":[19,33,0,0,20,33,0,0,22,33,2,0,23,33,0,0,12,33,0,0,24,33,135,1,40,35,64,0,0,0,45,35,0,0,0,0,46,35,1,2,0,0]},"229":{"type":"Buffer","data":[26,15,11,189,161,37,69,182,171,5,221,57,189,37,144,67,201,37,113,166,206,37,88,152,221,37,106,85,222,37,72,219,227,37,71,186,242,37,79,130,245,37,92,240,250,37,79]},"230":1,"247":{"type":"Buffer","data":[3,40,99,5,33,67,0,8,33,31,1,9,33,0,26,10,33,0,0,11,32,0,12,32,10,154,32,0,100,32,1,101,32,254,102,33,153,0,106,35,208,7,40,35,105,32,0,113,32,3,160,32,1,115,35,92,15,102,38]},"1301":1,"1302":100,"1303":3,"1311":0,"1312":0,"1315":{"type":"Buffer","data":[]},"1320":0.800000011920929,"1324":0,"65522":{"type":"Buffer","data":[170,117,19,132,204,126,7,65,0,15,12,35,1,1,0,26,10,35,8,0,12,100,11,32,5]}}},"genLevelCtrl":{"attributes":{"onTransitionTime":15,"offTransitionTime":15}},"lightingColorCtrl":{"attributes":{"colorCapabilities":24,"colorTempPhysicalMin":111,"colorTempPhysicalMax":500}},"genOnOff":{"attributes":{"245":1743499,"onOff":1}}},"binds":[{"cluster":6,"type":"endpoint","deviceIeeeAddress":"0xd878f0fffe9553a0","endpointID":1}],"configuredReportings":[{"cluster":6,"attrId":0,"minRepIntval":0,"maxRepIntval":3600,"repChange":0}],"meta":{}},"21":{"profId":260,"epId":21,"devId":0,"inClusterList":[12],"outClusterList":[],"clusters":{},"binds":[],"configuredReportings":[],"meta":{}}},"appVersion":31,"stackVersion":27,"hwVersion":1,"dateCode":"20251013","zclVersion":3,"interviewCompleted":true,"interviewState":"SUCCESSFUL","meta":{"configured":"0.0.0"},"lastSeen":1788023270505}

Debug log

No response

Notes

I have 3 bulbs from different manufacturer grouped and they work just fine

Start by reproducing the grouped toggle with the Aqara lumi.light.agl005 bulb and the reported {"state":"toggle"} command. Collect a debug log while comparing a one-bulb group with groups containing other bulbs; done means grouped toggle responds reliably, matching the expected behavior.