What I’ve seen in my part of the world for this cultivar is the more sun, the more yellow. I have had some browning like what you have, but only sparsely and I attributed it to too much Sun. I had mine in full sun and recently moved it cuz it was growing faster than I anticipated and was too big for its spot. Now it’s in partial sun and I’m getting a little browning. Thats probably from still getting established and I anticipate that by next year it won’t brown so much. The browning doesn’t seem to effect the trees overall health. If yours is newly potted in the heat of summer I would probably keep it in the shade as much as possible. Once its roots get established you should be able to give it more sun and it will be more

golden.

This is a faster grower in my experience so may not be the best for a pot long term.

any tissue other than green is very tender ... and subject to burn ...

it could be from water interference from repotting ... and/or too much sun ... especially if you repotted and put it in full sun.. without allowing it time to get the roots working properly ...

many of us have to grow yellow and white tissued plants in shade during the heat of the day ... to avoid such ...

if you take delivery of a new plant ... moving it from grower.. to seller.. to you ... who knows what cultural changes its gone thru ... it is stressed ... [do i need to define cultural variables?]

place it in full bright shade for about a month ... and water properly ... to get over those stresses ...

and then.. then you repot .. and add new stresses ... and put it back into the shade for a month or so.. then start bringing it into full sun ... with shade in the hot parts of the day.. where ever you may be ... repotting might best be done in fall or spring.. when the weather is more amicable .....

this same thing can happen in the colder north with winter wind/sun damage .. again.. on the other than green tissue ...

water deeply.. and let near dry in between waterings ... consider the sun.. and keep hot sun off a black pot.. no need to cook the roots ...

ken

This recent thread may be helpful: https://www.gardenweb.com/discussions/5972770/golden-hinoki-cypress-turning-brown#n=4