This is the 2nd time in the last week that this has happened, so I'm reporting it here: When I logged onto my realm on tuesday, commandblockoutput gamerule was enabled (and consequently spamming chat due to one of our scoreboards). I disabled it promptly.
The realm was fine yesterday when multiple people were logging on and off.
When another admin logged onto the realm a few minutes ago, the commandblockoutput gamerule was enabled again! I've disabled it once more. I'll update this report if I have the issue again. This is not our players or admins enabling the gamerule.
My theory is that admin log-ons re-enable commandblockoutput for some reason, but I need to test this more.
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I was also having this same issue, started happening after the last update

Does this happen every time you or another admin logs out, or only when all players log out (as described in REALMS-10253)?

Presumably when all players log out, as that's the condition required for a restart of the realm.
I can confirm that this is an issue. But mine happens daily. Also it's not commandblockoutput it's all of them.
I was having issues with the difficulty, keepinventory, randomtickspeed, firetick, tntexplodes, bedexplodes, and probably more that I have forgotten.
To resolve the issue I downloaded the world went to the world settings (not logging into the world) and set the gamerules and re-uploaded the world to the realm.
I left commandblockoutput on true and I have an add-on that automatically changes it to false. Everyday or at least nearly everyday I can tell that the gamerules reset when my command blocks trigger in chat before the add-on changes the gamerule.