Attached video shows the issue in question. This happens to both bulbs I have added, specifically TRADFRI bulb E27 WS globe 1055lm by IKEA of Sweden.
It only happens if I try to control them from a scene. If I turn it on manually, it will turn on to the last value as expected and stay there. But if I set it to 100% with a scene, it shows this behavior.
I can't tell if it's the scene that might be doing something wrong, but it works for the dozen other IKEA bulbs. These are the first of the E27 1055lm I've added.