"disable_jump" if the legs are inside the node

games/default/files/mobs_redo/crafts.lua

@@ -258,15 +258,8 @@ minetest.register_node("mobs:cobweb", {
 	drawtype = "plantlike",
 	visual_scale = 1.2,
 	tiles = {"mobs_cobweb.png"},
-	inventory_image = "mobs_cobweb.png",
 	paramtype = "light",
 	sunlight_propagates = true,
-	liquid_viscosity = 7,
-	liquidtype = "source",
-	liquid_alternative_flowing = "mobs:cobweb",
-	liquid_alternative_source = "mobs:cobweb",
-	liquid_renewable = false,
-	liquid_range = 0,
 	walkable = false,
 	groups = {snappy = 1, disable_jump = 1, speed = -30},
 	sounds = default.node_sound_leaves_defaults(),

src/localplayer.cpp

@@ -497,6 +497,12 @@ void LocalPlayer::move(f32 dtime, Environment *env, f32 pos_max_d,
 			|| sneak_can_jump;
 	if (itemgroup_get(f.groups, "disable_jump"))
 		m_can_jump = false;
+	// Determine that the legs are inside the node
+	v3s16 pos = getStandingNodePos();
+	const ContentFeatures &f1 = nodemgr->get(map->getNodeNoEx(
+		pos + v3s16(0, 1, 0)));
+	if (itemgroup_get(f1.groups, "disable_jump"))
+		m_can_jump = false;
 
 	// Jump key pressed while jumping off from a bouncy block
 	if (m_can_jump && control.jump && itemgroup_get(f.groups, "bouncy") &&