Unpacked and setup. When you plug the usual headphone in, the audio on the headphone jack varies with the remote control.
Will test later to see what happens when you turn on the TV speakers. Will headphones keep working?
This is a common request and this model line just may be your answer.
"Toshiba 50-inch 4K Ultra HD Smart LED TV with HDR - Fire TV Edition"
While I worry about PQ, it has an ANALOG OUTPUT with a headphone jack.
I've lost count of HDTV sets that do not have ANALOG OUTPUT.
The 55 inch model has this jack as well at https://smile.amazon.com/gp/product/B07D4DW9BN/ but today is $450.
The 50 inch may be the craziest deal out there but with 3 HDMI ports and that ANALOG AUDIO OUTPUT it may be what many were shopping for.
https://www.cnet.com/deals/toshiba-50-inch-4k-ultra-hd-smart-led-tv-with-hdr-fire-tv-edition/ notes the deal expires today.