As far as I know, this is all precedent set out by lots of rulings on timing windows. Examples from the top of my head:
Personal Evolution won’t deal a Net damage if corp scores an Agenda while Employee Strike in play.
When you install Daily Casts off of The Supplier, you don’t also get to trigger Daily Casts.
This means there’s like a 3 step result to resolving abilities at any triggering condition
-
Timing window occurs
-
Trigger all relevant abilities
-
Resolve all abilities triggered from step 2
Anything that comes into play or becomes active during step 3 has already missed step 2, and so it will not trigger.
@FightingWalloon there was a really big discussion a few months ago when this was all ironed out by @jakodrako. The results of those discussions and talks with the designers resulted in this ANCUR article which lays out what I just summarized with more depth and reasoning. @ironcache created a thread specifically to discuss this portion of the rules, which IMO is worth a read.