Protein On the Ketogenic diet

Protein is a vital nutrient for a healthy body. Most people think that on a ketogenic diet you have to keep your protein at a moderate level. That if you go over that level you will spike your glycogen levels and be kicked out of ketosis. That's simply not true the body needs at least .7 g of protein pre pound of lean body mass. Withholding protein from your body can lead to many health problems first of which would be muscle loss. If your not ingesting enough your body will take from your stored proteins (muscles, ligaments, tendons). Depending on the level of protein deficiency, a person who does not eat enough protein may suffer from any of the following symptom : Anemia, Anxiety, Dry skin or skin lesions, Fatty liver, Heart attack - wasting of heart muscle, Irritability, Loss of appetite, Reproductive problems, Susceptibility to infections and disease

Going over your protein intake here or there will do nothing to you in the long run however if your not eating anything but protein and your consistently going over you may make yourself stall or even gain. Same thing if your eating vegetables and protein but consistently going over your protein your body will have a surplus in protein and if your body is "full" and your brain is "full" GNG will not occur leading your body to store the excess in your fatty tissue as glycogen. Again this is due to a build up over time not one day going over your protein macro.  
there’s a few factors that effect this.

1.  How much body fat do you currently have. If lean it’s more likely to be a problem.
2.  Exercising allows for higher protein intake outside of 0.7 g / lbm. 
3.  Most definitely going well over protein daily can be an issue 

Gluconeogenesis (GNG)
Gluco – glucose
Neo – new
Genesis – creation
The generation of glucose from non-carbohydrate carbon substrates such as lactate, glycerol (fat), & glucogenic amino acids (protein). This mainly happens in the liver but can also happen in the kidneys & other various tissues.
Why GNG is a good thing
When your eating any carbs your body is not getting any glucose. Some parts of your body especially your brain need glucose to function properly. That’s when GNG comes into play, when you brain calls for a need of glucose your body will break the proteins and lipids you have consumed to make the glucose. Yay for how awesome your body is right.
“Gluconeogenesis is extremely expensive. Three steps of glycolysis are so energetically favorable that they are irreversible. Getting around them requires four gluconeogenesis-specific enzymes & the investment of a much larger amount of energy. Overall, six ATP worth of energy are invested to yield glucose, a molecule that only yields 2 ATP when broken down in glycolysis.” It just doesn’t make sense for the body to rely on gluconeogenesis from amino acids to create new sugar, just because it can. It will only do so when it has to. This is what people mean when they say gluconeogenesis is demand driven vs. supply driven. Because of this, it is unlikely that enough of this glucose will make it into the bloodstream that it causes a significant spike in blood sugar, because if there’s enough of a need for that glucose, the tissues needing it are going to use it. Not only that, but ATP concentrations need to be high enough for this process to happen. Side note: using the glycerol backbone from triglycerides is a different story. That only requires 2 ATP.
People seem to think that an increase in protein goes hand in hand with blood sugar increases, most likely from glycogen dumps. Most people assume it’s GNG causing the spike, it’s more likely glycogen. GNG only creates glucose when your body sends a signal that it needs it. There is no storage system for excess amino acids. Carbs are stored as glycogen in the liver and in muscle cells (a more "short-term and limited "tank") while fat is stored in adipose tissue (a more "long term - unlimited tank"). Excess amino acids can be converted to glucose (GNG) or fatty acids (lipid synthesis) via the TCA cycle. Which pathway used is largely determined by glucose need/glycogen replenishment. i.e. if muscle/liver is low in glycogen...glucose may be favored (to fill these "tanks"). This is common if one is in a caloric deficit. The liver will convert glycogen to glucose as needed. Or if one is working out, muscle glycogen will be used up and need to be replenished. If in a caloric surplus or not super active, these glycogen stores can fill up, and excess protein will favor lipid synthesis in the TCA cycle.
To conclude that once energy, glucose and protein requirements are met all excess amino acids will get converted to fatty acids and stored as body fat is incorrect. In recent studies there has been an increase in LBM. The excess protein is used to build muscle not store fat.

https://www.dietdoctor.com/dr-ted-naiman-ketosis-and-a-diet-rich-in-protein