Not so long ago
https://en.wikipedia.org/wiki/Carburetor_icing
The same / similar issue; Engine intake (
Carburettor) icing is caused by the temperature drop in the intake, - 'a Venturi'. …If the temperature drops below freezing, water vapour will freeze onto … internal surfaces of … the engine / intake.
https://skybrary.aero/articles/ice-formation-aircraft
,