Hello dear.
I tested 2 weeks for WIFI 6 stable and speed.
I fund, it was not stable.
I configed dual band 2.4G and 5G. --> Sometime very slow, like disconnect.
So, i changed config for wireless setup, dual -> only 5G. -> It was stable.
I request meraki team, you will need test that situation.
And MR55 must upgrade firmware.