i have had a similar issue i had 120+ stream streak with one streamer and i have evidence of my 109 streak dated April this year i haven't missed any streams and i was clips when there off for a few days or there vods they streamed 2 days in a row was there the next day gone and stuck on 2 streams watched and i have evidence i am in every stream either in the vod in the chat or collabing. and i want my streak back.

THIS. fix my stolen streak! I was in chat and active the whole time.

Same same and another member of the same chat I watch EVERY day. SO this happened to me (us) on Monday. Sent a ticket to Twitch they referred me here, I looked at my streak today and yet again reset to 1. I'm bugged I guess and Twitch really doesn't give a hoot about it. They can "experiment" but they can't-won't or simply do not want to give anything back. Frustrated!!!
They literally told me they sometimes experiment

I HAVE THE SAME THING HAPPEN TO ME!!!! I AM LIVID

We understand how frustrating it can be to lose your 150-day stream streak, especially when you've been consistent without missing a single day. While technical glitches sometimes happen, we recommend reaching out directly to support with any proof (like screenshots or logs) you may have. In the meantime, if you're unsure whether to continue or take a break, try using a fun tool like this Yes or No Wheel https://yesornowheeltool.com/ to help make a quick decision while things get sorted.