Because of the nature of the problem it's hard to have a solid process to reproduce the results. Maybe really just gauging what spawns in like a small town when entering it.

I didn't try this at the experimental (1.26) servers and the problem is unfortunately a bit vague, but as a programmer who often needs randomisation tools, this really has the feel similar to when there's some problems with the solid behaviour of the randomisation, like a sneaky bug with seeding the randomisation function properly. Of course I might be totally off and this is either by design or just the part of actual random events that don't feel random. Maybe in that case I would consider this as a feedback to augment the loot randomisation with some extra versatility. (It also feels like for example the sledgehammer doesn't spawn at all anymore, but that might not be true). But this "problem" is real enough that we have a joke with my friend of inventing backstories for different villages why they all left the same specific item to their homes :) But of course, not a huge issue.