After setting brightness within Home app (via HomeBridge) displayed brightness reverts to WLED setting possibly after polling? Actual brightness isn’t altered when displayed brightness changes.
Related info, the WLED brightness setting serves as maximum allowable brightness.
Example: WLED slider set to 77%, HomeKit automation set to turn on lighting at 27%, this occurs and is displayed properly for a short duration. When checking a short time later app displayed brightness is 77%. Lighting remains at 27%.
Also should note using the homebridge-wled-segment plugin in HomeBridge. Could be a plug-in bug.