Issue with the lurker: Unit disappears when entering the water (has swimming). Cause seems to be the beast rig has no proper swimming animations (depends on the beast rig), al the warg stuff sits in the boat. No proper solution found, was granted a boat when entering the water, will be granted embark so it costs less move points.
Possible alternative: Making it one solid unit (but will hurt the graphics significantly).

tunneling needs work. it's turning the solid dirt into diggable dirt, buuuuut it doesn't update visually past changing the dirt's color. i try digging it and now i have a dwarf just standing in a wall unnaturally. he can move freely as if there was no wall there however, so it *did* work. just not visually.
Edit 1: it allows the tunneling unit to go through, but other units still think that the cave is impassible

Thanks for notifying, will take a look into this.
Please note that if you are meaning the spell, it has to be casted twice to create a proper tunnel.

The spell has 2 functions:
1) Turn non diggable into diggable
2) Turn diggable into 'open tunnel' that can be entered by every unit

To me it sounds like you only casted it once to convert undiggable into diggable and entered with a dwarf unit that is capable of digging a tunnel (while the other units were not able to tunnel). But ofcourse I can be mistaken.

Either way I will test it and adjust where needed.

Not immediately clearing diggable earth sometimes has benefits (for instance indies might not come so easily).