In all the reading I've done I haven't actually read about a momentary truce, and it makes sense. Here's why:

The fighting in World War 2 was very different from the fighting in World War 1. Even without all of today's modern technology, for the most part warfare was more similar to modern conventional warfare than warfare of World War 1.

In World War 1, the two sides (on the Western Front) were perpetually within hearing distance of one another. The war was happening every second of every day, so understandably if one side really wanted to collect wounded, they would have to obtain a truce in order to do so. The Christmas truce happened because the two armies were literally just sitting within talking distance and they could have easily come to an agreement.

World War 2 was a war that went back to offensive maneuver warfare. On the battlefield, even on the front lines, the war was characterized by movement and maneuver. If you're close enough to the enemy, it was and is very important not to give away your position. You have no idea where the enemy is or how many of them are in the area (except whatever intel you're given). Just this fact alone made it very hard to ask for a truce. Shouting out would only give away your position, and you wouldn't even know if there was anyone around to hear it. Collecting wounded was done in fire because in general the position of wounded soldiers was relatively safer, compared to out in no man's land. In any case, much of the war did consist of small unit engagements that were ferocious but quick, and wounded could still be collected after. The word firefight certainly applied to World War 2, but if used in World War 1 would sound ridiculous.

This is only one of many reasons for why it might be much less common to see truces. In World War 1, having momentary truces was quite a common phenomenon early on (before poison gas), along all parts of the line, whether to collect wounded or dead bodies or sometimes to fraternize. There may be someone who has heard or read of a World War 2 truce but I have not, and in any case it would be a rare exception, rather than a occasional occurrence along the line.