I donāt want to be unkind but there are some lessons here for giving advice go others.
Please donāt take offence - the fact that you tried to help is good!! We need more of it here!
But you need to think carefully about the advice you give.
Not all admins are experienced. Many on CE looking for support here are not at all experienced.
So any advice must be carefully considered. Think about the consequences of someone giving you the wrong information and you bork your server when you apply it? You would not be happy!!
They donāt. They just assume that if you said it was OK (which you did) then they will be OK. Be aware that a lot of inexperienced users read posts here and your instructions could destroy their server. Microsoft have ensured that there are many who just accept what they see without question.
You must be specific and accurate.
No, you didnāt.
You literally just said:
āI rolled back - there is no problemā
No mention of your specific circumstances at all. What type of server, what type of installation etc etc. A thousand variables that mean it may be OK for you specifically, but not generally.
Again, no you didnāt, but you were indicating it was fine to do so with zero caveats. Many will blindly copy you without a second thought. I have seen it waaaaaay too often!
As it is there is no reason to downgrade, and patch will be out soon. See the bug:
Expect a new patch 6.9.2 containing the fix to be shared soon.
I wrote this recently. PRs welcome 
** Rocket.Chat Administration **
Thereās also this one I did years ago that has some tips on helping.
** Asking for help**
Please carry on helping - itās what open source and community is about! If you want help and advice on how to helping others please ask! I could do with some assistance 