Besides from just being a throwaway joke, I think this is quite an interesting line… Because for Mantis to look at himself and say this, he would have had to know that he had been a jombie + green when he was a jombie.
Like okay, he’s seen the jombies, and he knows they are green, and from everything that happened he could easily infer that he had been previously/posssibly still was turned into a green jombie, BUT for him to have this reaction he would have needed to have at least some level of self-awareness while he was a jombie. My point BEING that if jombies REALLY had no recollection/memories of being a jombie, this line from Mantis wouldn’t make any sense, because just being aware of himself would be enough to know that it was over and he was back to normal. It makes more sense in the context that he had some awareness while he was a jombie + aware of that jombie style of greeness, thus not being absolutely sure if he’s no longer a jombie in this scene. Also the next line “oh, wait, that’s my normal green” - aware of his having a different type/shade of green while a jombie.
And by extension, applying this to everyone - everyone having some level, no matter how small, of self awareness while they are in jombie form. This is my headcanon anyway, and I reckon it’s more fun than just a straightforward “no awareness whatsoever”. And while jombies are constrained I think they have a minimal level of control over their own actions, greater control if they innately have a greater desire to complete a certain action. Like if Kai gives a vague command - “attack” - they have control over how they choose to do that. For example I think jombie Shifu, on some level, actively chose to go straight after Po, not allowing himself to be deterred as easily as the other jombies… XD This control + awareness would be like, super minimal and largely inconsequential though, like I said. Also this means Shifu would rEMEMBER BEING HIT WITH THE FRYIN PAN OMG
They are the Furious Five. They always save the day. And if you think they can’t, they’ll always find a way. That’s why the people of China believe in Tigress, Mantis, and Viper, and Crane. (Monkey died)