>>I found that if I have some category filtered and I reply in this category, then I do not see the other people replies in my list of last 10 replies on the left side.
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>This would be normal as your account is set to filter those categories. You probably gain access to reply to such a message by bypassing the filter in the calendar page. Is that correct?

Yes, but the original functionality didn't filter replies if I replied in the category I filtered and I still saw the replies. Not anymore.