It references the only (standard) two other items with similar properties in the core books, and mentions "similar items". If it exploded on you when you used Plane Shift or Etherealness, or even when entering things like the suite of hideouts by Leomund or Moderkainen, I'm quite certain it would mention so.
Although, It would be fun to see the players' faces when you say: " Ok, guys you have just triggered a cataclysmal event by collapsing two extra dimensional pockets. You are being swallowed by a gate to the Astral plane, where you will most likely be enslaved by a bunch of Gythianki. Good luck!"
If spell-generated extradimensional effects caused the rift to the Astral, there would be a lot of pissed off 13th level characters using Mordenkainen's Magnificent Mansion for the first time. Or perhaps Mordenkainen bought a chunk of the Astral from the astral jawas, er, githyanki, so he could collect all the sorry suckers that made the mistake as his spell had an "arcane trojan" so people that made the mistake always appeared at the same point on the Astral. Hmm, sounds like a premise for an adventure...
I would say no. The destruction is triggered by items only.
Agreed with @filcat, the wording is pretty clear.
It references the only (standard) two other items with similar properties in the core books, and mentions "similar items". If it exploded on you when you used Plane Shift or Etherealness, or even when entering things like the suite of hideouts by Leomund or Moderkainen, I'm quite certain it would mention so.
Although, It would be fun to see the players' faces when you say: " Ok, guys you have just triggered a cataclysmal event by collapsing two extra dimensional pockets. You are being swallowed by a gate to the Astral plane, where you will most likely be enslaved by a bunch of Gythianki. Good luck!"
If spell-generated extradimensional effects caused the rift to the Astral, there would be a lot of pissed off 13th level characters using Mordenkainen's Magnificent Mansion for the first time. Or perhaps Mordenkainen bought a chunk of the Astral from the astral jawas, er, githyanki, so he could collect all the sorry suckers that made the mistake as his spell had an "arcane trojan" so people that made the mistake always appeared at the same point on the Astral. Hmm, sounds like a premise for an adventure...
We all leave footprints in the sands of time.