================================================================
The fix is to replace FallSpot in botutil.qc with the following:
================================================================

void() FallSpotGround =
{
	fallspot_self = self;
	self = dropper;
	self.origin = testplace;
	self.flags = FL_ONGROUND_PARTIALGROUND;
	if (walkmove(0, 0))
	{
		if (!(droptofloor()))
		{
			self.origin = testplace + '0 0 -256';
			if (!(droptofloor()))
			{
				fall = FALL_DEATH;	// too far to fall (no need further check)
				self = fallspot_self;
				return;
			}
		}
		content = pointcontents(self.origin + '0 0 -24');
		if (content == CONTENT_LAVA)
			fall = FALL_DEATH;
		else if (self.origin_z < fallheight)
			fall = FALL_LAND;
		else
			fall = FALL_FALSE;
		self = fallspot_self;
		return;
	}
	else
	{
		fall = FALL_BLOCKED;
		self = fallspot_self;
	}
};

===
and
===

void() FallSpotAir =
{
	fallspot_self = self;
	self = dropper;
	self.origin = testplace;
	self.flags = FL_ONGROUND_PARTIALGROUND;
	if (walkmove(0, 0))
	{
		if (self.origin_z > testplace_z)
		{
			fall = FALL_BLOCKED;
			self = fallspot_self;
			return;
		}
	}
	else
	{
		fall = FALL_BLOCKED;
		self = fallspot_self;
		return;
	}
	if (!(droptofloor()))
	{
		self.origin = testplace + '0 0 -256';
		if (!(droptofloor()))
		{
			fall = FALL_DEATH;	// too far to fall (no need further check)
			self = fallspot_self;
			return;
		}
	}
	content = pointcontents(self.origin + '0 0 -24');
	if (content == CONTENT_LAVA)
		fall = FALL_DEATH;
	else if (self.origin_z < fallheight)
		fall = FALL_LAND;
	else
		fall = FALL_FALSE;
	self = fallspot_self;
};

=============================================
and replace AvoidHazards in botthink.qc with:
=============================================

void() AvoidHazards =
{
	new_velocity = self.velocity;
	if (self.path_state & JUMP_LEDGE)
	{
		if (time > self.arrow_time2)
		if (self.flags & FL_ONGROUND)
		{
			rel_pos = (self.linked_marker.absmin + self.linked_marker.view_ofs) - self.origin;
			if (rel_pos_z > 18)
			{
				hor_normal_vec_x = 0 - rel_pos_y;
				hor_normal_vec_y = rel_pos_x;
				hor_normal_vec = normalize(hor_normal_vec);
				jumpspeed = new_velocity_z + JUMPSPEED;
				if ((jumpspeed * jumpspeed * 0.000625) >= rel_pos_z)	// 0.000625 = 0.5 / sv_gravity
				{
					self.button2 = TRUE;
					return;
				}
			}
		}
	}
	else if (self.obstruction_normal != '0 0 0')
	{
		if (time > self.arrow_time)
		{
			if (self.flags & FL_WATERJUMP)
				return;
			if (vlen(oldvelocity_) <= 32)
			{
				dir_move = new_velocity - (self.obstruction_normal * (self.obstruction_normal * new_velocity));
				if ((dir_move_x == 0) && (dir_move_y == 0))
					dir_move = (-1) * self.obstruction_normal;
				else if ((oldvelocity__x == 0) && (oldvelocity__y == 0))
				{
				// maybe stuck in a corner
					if (random() < 0.5)
						dir_move = (-1) * dir_move;
				}
				else
				{
					dir_move = normalize(dir_move);
					dir_move = dir_move + normalize(new_velocity);
				}
				dir_move_z = 0;
				makevectors(self.v_angle);
				BestArrowForDirection();
				NewVelocityForArrow();
			}
		}
		new_velocity = new_velocity - (self.obstruction_normal * (self.obstruction_normal * new_velocity));
	}
	if (self.waterlevel)
		return;
	hor_velocity = new_velocity;
	hor_velocity_z = 0;
	hor_speed = vlen(hor_velocity);
	if (!hor_speed)
		return;
	dir_forward = normalize(hor_velocity);
	fallheight = self.origin_z - 36;
	if (self.linked_marker)
	{
		min_second = self.linked_marker.absmin_z + self.linked_marker.view_ofs_z - 36;
		if (fallheight > min_second)
			fallheight = min_second;
	}
	if (self.flags & FL_ONGROUND)
	{
		if (new_velocity_z < 0)
			new_velocity_z = 0;
		last_clear_point = self.origin;
		testplace = last_clear_point + new_velocity * (16 / hor_speed);
		FallSpotGround();
		if (fall == FALL_BLOCKED)
		{
			first_trace_fraction = 1;
			TestTopBlock();
			if (first_trace_fraction != 1)
			{
				testplace = last_clear_point + new_velocity * (16 / hor_speed) * first_trace_fraction;
				new_velocity = new_velocity - (first_trace_plane_normal * (first_trace_plane_normal * new_velocity));
				hor_velocity = new_velocity;
				hor_velocity_z = 0;
				hor_speed = vlen(hor_velocity);
				testplace = testplace + (new_velocity * (16 / hor_speed) * (1 - first_trace_fraction));
			}
			FallSpotGround();
		}
		if (fall >= FALL_LAND)
		{
			new_fall = fall;
			testplace = self.origin;
			FallSpotGround();
			if (new_fall > fall)
			{
				if (time > self.arrow_time2)
				{
					current_fallspot = fall;
					new_origin = self.origin;
					if (CanJumpOver())
						return;
					new_velocity_z = new_velocity_z + JUMPSPEED;
					if (CanJumpOver())
					{
						self.button2 = TRUE;
						return;
					}
				}
				AvoidEdge();
			}
			return;
		}
		testplace = testplace + new_velocity * (16 / hor_speed);
		FallSpotGround();
		if (fall >= FALL_LAND)
		{
			new_fall = fall;
			new_origin = testplace;
			testplace = self.origin;
			FallSpotGround();
			if (new_fall > fall)
				RunAlongEdge();
		}
	}
	else
	{
		local vector dummy;
		new_origin = self.origin;
		testplace = new_origin + new_velocity * (32 / hor_speed);
		dummy = testplace;
		FallSpotAir();
		if (fall >= FALL_LAND)
		{
			new_fall = fall;
			testplace = new_origin;
			FallSpotAir();
			if (new_fall > fall)
			{
				testplace = new_origin + new_velocity * (16 / hor_speed);
				FallSpotAir();
				if (new_fall > fall)
				{
					current_fallspot = fall;
					if (CanJumpOver())
						return;
					AvoidEdge();
				}
			}
		}
	}
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