Are you testing this with the basic tier 1 recycler? In the latest 6.1.x updates, I have added 2 higher tiers of recyclers, with only the t4 being able to recycle anything which can use productivity modules (including almost everything in the intermediates tab).
If you can't view or research the higher tiers of recyclers, then I might have a bad migration script, or maybe the technology I attached it to as a prereq no longer exists. Hopefully that's not the issue.
As for probability based recipes... I'm still working on that. I've removed them all for now because they all cause an error on load. Sometimes the recipe in question simply creates a byproduct alongside the main product, but sometimes the item IS the byproduct. I'm not entirely sure how these should be handled (especially when I'm also filtering out recipes that have multiple results)
However, steel gears should be a basic 2 steel into 1 gear, right? So that might just be gated behind the t4 recycler. Gas bottles sound similar to the iron barrels from vanilla, so it might similarly be a productivity based recipe, gated behind the t4 recycler.
Also also, I have a way for modders to define recipes that they do not want to be recyclable, either because they might cause errors, or because a certain recipe doesn't make sense in reverse. Space Exploration mod actually defined a bunch of categories to be non-recyclable, so almost half of the mod's recipes could not be recycled. They were also all probability based recipes.