I've found when you hear complaints about bunker sand in new bunkers it's typically soft sand caused by the bunker liner, and not the fault of the bunker sand itself.
Most of these new bunker liners dry the sand out too much causing plugged balls.
Really? Most of the bunkers I’ve seen w the sprayed epoxy or porous concrete end up w an algae problem and are very wet v very dry.
I've seen the bottoms stay wet, but the faces seem to be too dry, especially up high close to the lips.
I know of three clubs in my area that have recently renovated bunkers, all with different systems, all have bunker faces that almost turn to powder during a dry week, two are hand watering bunker faces when labor permits during a dry week to keep the faces damp and firm... again, seems to be worse high up on the face close to the lips.
The porous liners (like Blinder, Better Billy, Cap Con) all create a perched water table just like a USGA spec green. In doing so it technically can help in controlling how wet or dry the sand plays. The issue runs into sand depth - which controls the moisture level - so maintaining it perfectly would need a full time crew as there's a fine line between too wet and too dry.
Most bunker specs look for ~4-5" of sand, however in most cases this is not enough to provide the hydraulic head for the water to overcome the perched water table created with using a liner. The liner particle sizes are consistent for each liner but the sand particles will vary on which sand was used so each sand will behave differently when the interact with the different liners ie in some cases 4" is enough. In others 6" isn't enough and you get firm bunkers or algae forming on the surface. If the sand is too deep then the water will flow through and you'll get fired eggs as the surface will be dry. This will change too as the sand compacts ie it may perform well when it's first put in but as it settles, it drops maybe an inch and now it no longer has the head to drain. The same principle is happening on the slopes as gravity is moving the water to the bunker floor creating the hydraulic head to drain the water - hence the drier faces.