First thing I'll say is that this is easily the best tf2 weapons mod I've tried so far, but with source engine jank it's bound to have some bugs. There are a couple things that I'll exclude despite not aligning with TF2, but that's because I just don't really know how possible they'd be, for example the Ambassador's headshot cooldown, Flares critting burning players, etc.
I'm also aware that a discussion like this already exists, but it's really unorganized so figured this'd be worth making. This is also my first time starting a discussion like this, so apologies if I mess up the formatting.

Force-a-Nature - Deals no knockback
Sandman - Ball doesn't appear in viewmodel, sometimes the bat itself will float out of your hands if you pick something up with E while holding it

Rocket Launcher, Beggars Bazooka - No third person animations
Direct Hit - No self damage
Righteous Bison - Fires nothing

All Primaries - No third person animations
All flamethrowers (yes there is a difference) - No airblast animation
Nostromer Napalmer - World model appears as a big ol' error
Dragons Fury - Airblast has no effect on NPCs
Detonator - Can't explode
Hot Hand - No third person animations
Primaries - Not so much of a bug and more of a suggestion, the flamethrowers deal quite high damage and the Dragon Fury's doesn't feel very powerful in comparison

All grenade launchers - Their pills fire at an odd arc
All Stickybomb launchers - Stickies fire at an odd arc, cannot be charged to travel further, all can have way more than the intended sticky count

All miniguns - No rev up/down animation, no limited movement upon revving.
Minigun/Iron Curtain - No animations from third person
All fists - In third person, they show up as pistols
Holiday Punch - This isn't a bug but more of a suggestion, you might be able to get the laugh on "backstab" by using something similar to how spies knives work and having them trigger "act laugh"

Gunslinger - Same thing as Heavy's fists


All Sniper Rifles - No UI for when you're scoped, sensitivity is too intense when scoped, they all deal much greater damage
Sniper Rifle - No third person animations
Classic - No silly charge
Huntsman/Fortified Compound - No third person model
SMG - No third person animations
Kukri/Bushwacka - In third person they are held awkwardly

All Syringe Guns - They all use bullets, it's really funny though so I don't mind
Medi Gun - No third person animations
Some Medi Guns - Uber effect will persist upon putting it away, some also have bugged crosshairs

By some miracle, haven't found any

A couple melees across various classes have a muzzle flash
Not a bug but a suggestion, move all the weapons into their proper slots