Hello,
I recently played through the mongol campaign.
On the luman shan map the enemy waves get stuck in the forest
it was reported here but i would like to add more to it. - Mongol campaign Blockade at Lumen Shan
Below is a screenshot of where the waves get stuck as a result of a pathing issue.
Credit to matony1989 on reddit for the screenshot, mine got stuck in the exact same place
It is also possible for them to get stuck on the top route if you wall close to the map edge. A spearman was stuck just outside my LOS