Just a side note here, Arthur... the main reason for having a telltale is simply to let us know that the impeller is pumping water up the powerhead. It really has nothing to do with indicating/not indicating any kind of overheating. Meaning, the engine can overheat with a perfect pee stream and the engine can also run perfect with no pee stream at all.
So, what might be happening here is that there is a slight blockage and the hose is not strong enough to force water through. Or, maybe the hose volume/pressure is different than before. If the engine is at a different tilt level, that might play into this, as well. I'd keep an eye on it, but I wouldn't worry about it. Some engine pee while on the garden hose flush attachment, some don't. I've seen some engine pee sometimes, and not other times. Water will follow the path of least resistance, and with the volume of water limited because it's only the amount through a hose, it might be flowing easier through the block, then the small orifices for the pee hole passage. The most important thing is that it's peeing while in the water. But, again, just keep an eye on it for now.
Does it pee on muffs?