Commanding units to a location which would require going around a Spider Lair instead results in them walking into the Spider Lair and getting stuck on the cobwebs, so you have to move them around or out of the lair manually to compensate.

This is a minor issue but it is a bit of a headache when it happens and you don't notice immediately. Making the units path around the Spider Lair and/or not get affected by cobwebs would help with this issue.

Tested with other factions and similar things happen with Piglins and Flame Sanctuaries, basically any building with hazards built-in. It's actually a bigger problem with Flame Sanctuaries as units tend to get themselves killed if they get stuck in the lava when pathing back

Zombies walking through the spider lairs also break turtle eggs decreasing the building health