Could you elaborate on what you mean? Where is it NOT showing the battery level when it should be?
I wasn't even aware that this was something Android (11) was supposed to do, but I just checked myself (I have the Galaxy Buds+):
Under the Bluetooth quick setting, it shows the battery level of my earbuds.
Is that what you're expecting and it isn't happening? Or are you expecting the battery level to show somewhere else?