Eggs in compost

Is it an Osmacote infestation? 

Have a look here
https://yourindoorherbs.com/what-are-yellow-orange-balls-in-soil-should-you-be-worried/

What are yellow balls in soil? Most of the time, they are fertilizer balls, although they might be eggs.
Eggs are slimy, soft, and often all gathered in one place.
If they’re eggs, what might they belong to? Slugs or snails, worms, ants, ladybugs are the most likely culprit.

Sorry but that looks like snail eggs. If they pop when you squish them they are mollusc eggs. If they are hard and unyielding they are more likely to be slow release fertiliser pellets. I’ve just discovered a load in my hosta pot at home, had to remove all soil, replace with new , add slug pellets and re pot ( it needed it anyway as it was grossly pot bound).