Hov do I get dimmer slider to update position based on KNX dimmer feedback in OH3?

[rossko57]

@rosivertsen

Openhab updates status automatically seemingly without reading GA for switch status.

A detailed look at the autoupdate feature that you have noticed.

Autoupdate - a primer

I’ve found myself having to investigate and/or explain some of the features of autoupdate over time, and thought an in-depth view would be helpful. These notes apply to openHAB version 2.5 Overview Autoupdate is primarily a “speed up” feature for openHAB Items. Mostly we can ignore it, but sometimes you may get an unwanted or unexpected effect, or you may wish to exercise more control. To fully understand autoupdate, we must understand the difference between command and state of Items. If w…

@rosivertsen

This does not work with dimmer value for some reason, even though I added the dimmer status channel and linked to dimmer item in OH3.

This is probably the part you need to look at more closely, not locations and points.
Get your device updating the openHAB Item.
Show your Thing channel settings to see if someone KNX familiar can help.