My U-19 team players disappeared

I'm playing in Hyundai A-League as Wellington Phoenix.

In the editor I created U-19 team.

Sometimes I can see my youth squad, but generally my squad view is empty. I can see my players only in training view.

I can move them to first squad (which is vissible), offer new contracts, set training, but I’m unable to for example choose match squad.

Sometimes youth team from other clubs become invisible too

Is it a problem in my edited database?

Or is it another problem with Australian league?

Such a pain that Wellington doesn't have a Youth team isn't it! I can't really help because I don't edit but I can say that for the other clubs the Youth team are generally uncontracted players (greyed out). When in the past I have had an injury and tried to promote one of my greyed out youth players (without first offering him a full time contract and therefore making him 'real') they dissappear from the game forever - I definitely think there are bugs with the A League side of the game as most people wouldn't play it. I challenge anyone in the world to beat my Adelaide United team on 28.8K/week budget.