A screen-grab from a film showing why the A90 would have been of doubtful use in the amphibious assault role.
As it had no ability to back off the beach it had to swing around in an arc using its nose mounted lift engines.
The result of that maneuver isn't pretty, I'd guess that the Marines weren't impressed.

Image from:
High Speed Marine Craft: One Hundred Knots at Sea
Peter J. Mantle, 2015, Cambridge University Press, NY

IMG_2114.png
 

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From this book, Ростислав Алексеев. Конструктор крылатых кораблей
 

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https://oldmachinepress.com/2019/11/20/alexeyev-sm-6-and-a-90-orlyonok-ekranoplans/
Rostislav Alexeyev (sometimes spelled Alekeyev) of the Central Hydrofoil Design Bureau (CHDB or Tsentral’noye konstruktorskoye byuro na podvodnykh kryl’yakh / TsKB po SPK) had been working out of the Krasnoye Sormovo Shipyard in Gorky (now Nizhny Novgorod), Russia since the 1940s. In the 1950s, Alexeyev began experimental work with ekranoplans (meaning “screen planes”), also known as wing-in-ground effect (WIG) or ground-effect-vehicle (GEV). His work led to the construction of the massive, experimental KM (Korabl Maket or ship prototype) ekranoplan in the mid-1960s.

As work on the KM was underway, the Soviet Navy expressed interest in a troop transport ekranoplan, and Alexeyev had started design studies of such a craft as early as 1964. In 1966, the decision was made to construct a 50-percent scale test model of the troop transport. The test ekranoplan was designated SM-6 (samokhodnaya model’-6 or self-propelled model-6).
 
The layout and basic design solutions of the Strizh were used to develop a family of small civil ekranoplanes with a take-off weight of 1.6-5.0 tons, including the Strizh-3 (Kulik) with two Zoche-Munich aviation diesel engines of 300 hp or M-16, Strizh-4 (Cormorant) with two TIGO 541E 450 hp aircraft piston engines (Lycoming) or TDA 450, Strizh-5 with two Merlin 650 hp aircraft diesels. One prototype of the Strizh was built, and in mass production — the Strizh-M with engines Voyager 300" 220 hp by Teledyne Continental Motors or M-17.
 

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