Can I set default speaker to optical and not internal speaker?

[Kuriko]

I have a LG OLED C9 and use a soundbar with optical. If I use Bluetooth headphones and terminate the connection, the webOS always jumps back to internal speakers, which I don't use. Is there any way to set it to automatically return the soundbar (optical)?

[BronzeCheetah]

Under sound in settings do you have optical selected or optical + internal speaker selected?  Also if the soundbar is powered off the internal tv speaker is used until the soundbar is powered back on

[Kuriko]

My sound settings is only "optical" not "optical and internal speakers", so I don't unterstand why he jumps back to "internal speakers". When I start my TV the soundbar powered on with optical and all working fine. When I connect my BT headphones, all working fine with BT headphones, but after disconnect BT the TV jump back to internal speakers, not optical.

[td47]

@Kuriko  It sounds like a firmware bug, report it to LG support.