Does your screen wake up when do not disturb is turned off? I want it to wake when dnd is off but not wake when it's on.
My s8+ worked perfectly with textra.
Yes, if i turn setting in Textra to "Yes except when on silent", screen turns on, when do not disturb is off.
Just tested it now, waking up when do not disturb is off .
However,
i choose not to light screen up at all and rely on sound., thus Textra setting is set to no. Thus I don't have this issue.
Further,
I set Textra to your settings.
"Do not disturb" and Textra to" Yes except when on silent"and my results is the same as yours.
Screen lights up in Do not disturb mode.
My opinion is that it is a Textra issue, not phone.!
As you using 3rd party messages app
Not the stock messages system app.
I would contact dev of Textra and explain
conflict that Textra somehow does not
read/interpret Do not disturb (phone) as silent in Textra
(on the Note 9) .
I'm sure the dev can test this "compatibility reading " issue, somehow ?
Good luck