Ideas
Thanks for your report, we've been looking into this and unable to reliably reproduce it so far. If you have any mroe details that ay help please let us know!
Are you able to see this issue occur everytime you fight es-garg-ot or or is it intermittent or only on specific levels with specific loadouts?
Mr./Ms. Wren, I now have more information as you required! The glitch happened again.
It occured on Campground Expedition Chapter 1, Level 5 again, like last time. And just like last time, Es-Garg-ot vanished into thin air when it tried to roll into an Amphibious Plant, in this occurence's case, a Zapture.
This time, Es-Garg-ot spawned on the First Lane of the layout as shown below:
When Es-Garg-ot tried rolling into the Zapture on the First Lane, Sixth Column, it disappeared before it could even make contact with the Zapture in question.
I am now convinced that the issue is related to Amphibious Plants, not just limited to Tangle Kelp, but all his Fusions. More specifically, it occurs when Es-Garg-ot trieds ramming into an Amphibious Plant on Water Tiles.
Since this issue happened twice on Camp Expedition Chapter 1, Level 5, in my opinion, it could be the ideal level to recreate this glitch.
Thanks for reading, and have a fantastic day, Mr./Ms. Wren! :D