Am not sure if i have 100% understood your issue because the “Amazon Echo Control” binding and the “openHAB Alexa skill” are 2 different things.
There are known and also pretty old issues with the “Amazon Alexa skill”. It carries out commands but most of the item states are not updated then except a very few. See e.g. OH 5.0.3 item states are not retrieved/updated by Alexa or Value of CurrentTemperature Item not displayed in Alexa . This issue seems to depend largely on Amazon and as long as OH commands are carried out, most of the OH users are satisfied. I personally moved for most of my Alexa commands to the Matter binding which allows to integrate even very old devices.
I use the “Amazon Echo Control” binding mainly for execution of voice commands, setting of Echo volumes or playing radio channels. Have not yet observed anything not working.