Someone just mentioned that their past notifications disappeared. The same just happened to me.
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@NurseNinaPa this may or may not be what is happening to you, but I personally was confused why my notifications were essentially frozen....until I realized I had selected "mentions" and not "all" at the top of my notifications column. Miraculously, pressing "all" revealed everything! LOL!😜
@LauraLyon451 Nope, my notifications disappeared from both ALL and MENTIONS, but they are back now.
I'm sure its platform "growing pains" ;)