Something curious.
Prior to 1.17 patch (could've been sooner tho, hadn't played a collector since HELS), the behavior i observed was that spawners respawned:
- Every time the lot was 'reset', that's for community lots.
- Some time after a certain threshold number of collectibles have been collected.
So "no red assassin bugs" was just a matter of grabbing the collection helper and grab bugs until the game respawned them.
Post said patch, something rather odd have been happening, at some point at night, all spawned stuff just plain disappears, neither rock nor seed, not even a cockroach on the map. At some point during the morning, they just poofed into existence again.