Restricted area after/During time-out?

[BDevil15]

Hi all,
Obligatory, I'm a coach not an official, hope you are all having a great summer. So we are playing in a summer league which plays full 8 minute stop clock 5 time outs, high school officials, by the rulebook basketball, not that that really matters except to say that this isn't some fly by night lets just play league officiated by the first 2 parents to walk in the gym.

We score late in the 4th quarter to go up one and the other coach calls a time out with 10 seconds on the clock. We do our time out, the first horn sounds, and the officials beckon us to return to the court. We say our "Team Chant!" and break the huddle and players head for the far end to play defense. Now well before the ball is in bounded, the other coach calls to his point guard to come over to him and my point guard follows him right up to the bench. The coach goes ballistic screaming at my kid saying he cant do that, he's in their huddle(2 man huddle) and just going crazy. My kid who is a Sophomore and not completely sure of himself looks at me and I just shrug my shoulders to see what happens next. The official closest to the bench finally comes over and tells my kid to move away which he does immediately.

But why should he have to? Is there a restricted area around a bench until the ball is returned to play after a time out? After the game both officials said that they could have issued an unsporting T and I just don't see it. Is there something I'm missing?

I have had a similar discussion about players standing near opposing coach during free throw administration and that seems unanimously acceptable.

Curious about what you all think.