During the game, the object-sprite A collides with the object-sprite B and therefore the two object-sprites are separated (separate two objects). I noticed that following this operation, the system no longer even detects the collision between .sprite-object A and sprite-object C. (Is this situation correct?)
In my game, the sprite-object C must always check if it collides with the sprite-object A or the sprite-object B, without however that the sprite-object C is separated from A and B, while if A collides with B must be separated, but in any case C must always be checked if it collides with A and B.
Resolved. Sorry, but after a couple of weeks I discovered that the problem was in the collision mask which, for a previous version, I had modified the mask.
This discussion can be closed. Thank you