Understanding Crohn's Flares

I have Crohn's. I am currently "in remission" using Entyvio. Recently I was certain I was in a flare, experiencing abdominal pain and cramping, the beyond fatigue and constant diarrhea that went on for days. I contacted my GI and was put on Prednisone (which I hate) and he scheduled colonoscopy. 5 1/2 weeks later he did a colonoscopy and was told I wasn't in a flare - showed no bowel damage, there was some inflammation, so it must be my IBS. I have never had a IBS event that felt like this and lasted that long. It was like I felt when I was hospitalized and diagnosed with Crohns and multiple times since. Also my labs were elevated as with previous flare. My question is it never a Crohns flare if they don't see damage. I'm confused about what a flare is then and how is a flare treated. I hadn't eaten anything that triggers my IBS but had tried taking Monjuaro but couldn't tolerate it and had quit taking it more than a month before. Sorry this my be more than one question.