The "turn start" phase and "positioning cards" phases of a turn BEFORE the resolve phase are not in sync with the other player until the resolve phase starts.This creates many issues. Basically, either you or the opponent will see a decrease in morale or health that the other player will not see! This causes the desync as one of the players are directed to the post-game screen and the other player hangs in their turn passing indefinitely as the resolve phase doesn't sync.

Example 1.a.
In this example, I can move weakened militia which have less than 1 health unless enough of the militia are in the same zone.
On my side, when I put all the militia in the same zone, they'll be 7/4s. This does not sync the same way on the opponents' side when the resolve phase positions the cards.
The opponent sees this in their resolve phase...
*Moves militia to assault zone, it becomes a 2/0 and dies*
*Moves militia to assault zone, it becomes a 2/0 and dies*
*Moves militia to assault zone, it becomes a 2/0 and dies*
*Moves militia to assault zone, it becomes a 2/0 and dies*
*Moves militia to assault zone, it becomes a 2/0 and dies*
*Moves militia to assault zone, it becomes a 2/0 and dies*
*Moves militia to assault zone, it becomes a 2/0 and dies*
*All the millitia come back to life as 7/4s in the assault zone*
Factionless player loses 21 morale. Opponent wins.
The factionless player sees a bunch of 7/4s in the attack zone ready to pummel face but the turn will not move to the resolve phase due to a desync in data sent to the opponent.
This issue does not only affect Militia.
This will affect Pack Leaders buffing beasts that are weakened but not killed.
This affects people who draw with no cards in their deck, registering a morale defeat that the opponent does not see. (Although this one might have been fixed in 0.77)
This affects all other temporary of specific pump-ups that have criteria met.
This can be fixed by only doing a character health check AFTER the positioning phase is done and before the "Abilities" phase starts. Very simple.