Exception - Buffer Underflow when attacking mobs after Steam update (29 May)

Hi,

Problem
Since the Steam update on May 29th, I'm getting Exception - Buffer Underflow crashes. Everything was working fine throughout the entire league before this update.
Stable in Hideout and towns. Crash occurs only when entering Acts, Maps, or any Endgame content — specifically when attacking any monster.

System Specs
OS: Windows 11 Pro
CPU: Intel Core i5-10400F @ 2.90GHz
RAM: 16 GB
GPU: NVIDIA GeForce GTX 1660 SUPER 6GB
Storage: SSD 500GB

Graphics Settings
Renderer: DirectX12
Triple Buffering: Enabled
Multithreading: Enabled

What I've already tried
1. Deleted ShaderCache and Minimap folders in %AppData%\Path of Exile
2. Changed Renderer and all graphics settings
3. Switched between different gateways (Paris, Frankfurt, Moscow)
4. Changed Hideout, recreated instances in Acts, tested Valdo's, Einar's Menagerie, and regular maps — crash happens everywhere when attacking a mob
5. Verified game files via Steam
6. Restarted both the game and PC

Issue is still present as of May 30th.

Screenshot

I had the same problem, removing all MTX from my character fixed the issue for me. Equipping the MTX again after still seems fine.

Hope this works for u as wel :)

Thanks for your reply,

Removing all MTX completely fixed the crashing, but, as soon as I equip any MTX back and try to attack a monster, the game crashes again with Exception - Buffer Underflow :(

Equipping after image flicker strike causes it every time I attack.

When equiping my mtx again i forgot to equip the flickerstrike mtx again. After equiping the afterimage flicker strike mtx i get the buffer underflow crash again. The ghost and demonic flicker strike mtx do not cause the problem so seems to be related to the afterimage flicker strike effect specifically.