Sengled have also become tricky to fully reset. You may think they reset, but they only partially do. Anymore, I reset twice and only by putting them into a lamp connected to a power strip I can quickly toggle. A regular light switch may not be fast enough.
Ignore the QR codes, they never work right. As mentioned above, connect the generic way. I had 12 of these bulbs in my last house and they’re great and stable after connected.