While Onyx is a nice RSPS, there has been a list of bugs. Of course, only one I encountered is game-breaking but it would be nice to have those bugs fixed.
Gates and doors don't work properly. While they can be opened, they can't be closed. Also gate splits into two. Mousing over the opened door will show "Open Door" on tooltip instead of "Close Door"
You can't chop down trees with iron hatchet if you don't have bronze hatchet in toolbelt. Using the axe on tree results in "Nothing interesting happens". Turns out the bug happened at 1 Woodcutting.
Sometimes when travelling in Runespan, you'll get stuck in a void and you'll have to teleport out.
The nodes spawn in wrong place in Runespan, being unsiphonable, and they may cluster together. You can find high-level nodes in bottom floor too.
If you make air runes in Dungeoneering, you might end up making a lot at higher runecrafting levels, much more than you've expected. Because of that, I made tens of thousands of air runes from just 100 essences at 36 Runecrafting. This results in 770 air runes every 10 essence used.
The fishing spots at Karamja don't work, resulting in "Nothing interesting happens".
If you use superheat on iron ore with coal in your inventory, it makes steel bars without consuming coal.
If you make some items with stackable resources in Dungeoneering while having full inventory, the produced items aren't dropped, effectively destroyed.
Red-eye doesn't have a proper examine, being "It's a Red-eye" instead of "I wonder why they call it a Red-eye. Its eyes don't look very red! (Tier 2)"
Defensive casting is inverted. When selected, it's actually off and doesn't give defense exp. If unselected, it does give defense exp.
If you click on the flashing skill icons, they sometimes won't stop flashing and you have to re-log.
Skoblins in Lumbridge Catacombs have only 1 HP and don't drop anything.
Port Tyras has objects with no textures. They look like as if they're made of plastic. Trees, rocks, crates and the dock have no textures.
Many objects in Zeah have no textures as well.
Mask parts don't seem to be dropped at Lumbridge Catacombs.
Shilo village blacksmith door cannot be opened at all, would be better off removing that door.
Chickens still burn on range at 45 cooking and raw rat meat can't be cooked on range. Bear meat and yak meat still cannot be cooked.
Iron spit is spelled incorrectly as split in smithing interface.
If you try to craft logs without tools, chisel is spelled incorrectly as "chisle".
When burning a food, it reads "Oops, you accidently burnt the <food>" and it should spell "accidentally".
When being offered the choice between fighting and fancy boots for the first time, the fighting boots have a typo "teh".
Skill Guide Missing Entries
Anglerfish and dark crabs don't appear in Fishing and Cooking.
Lovakite doesn't appear in Smithing.
Zenyte jewellery doesn't appear in Crafting.
OSRS equipment and dragon crossbows don't appear in list of respective combat skill unlocks.
Redwood trees/logs don't appear in Woodcutting and Firemaking.
I've put some screenshots as well. https://imgur.com/a/LfBcF