ZX Spectrum 48k with 128k interface, the game starts well, cutscenes and selection screen ok, the AY music and sound effects are perfect, but when the gameplay starts the scenario appears normal and the spaceship is not there, only the shooting sounds.
This interface https://www.tindie.com/products/goloskokovic/128k-ram-expansion-for-zx-spectrum/
I've tested several games at 128k, and this bug only happens in two games, Redshift and Fire n' Ice. I'm tried .tap .tzx and .trd, same results.