Saryn spores cannot be easily popped while in the rift

[Sailoo]

Saryn's spores can't be popped while inside the rift because they are considered to be outside the rift. Using abilities such as miasma or toxic lash doesn't pop them either.

However you can still kill the person with the spores while in the rift or pop the spores from outside the rift or from standing outside the cataclysm bubble and it would spread.