5.5.4 hotfix breaks compatibility with 5.5.3

General Feedback & Requests
1

In version 5.5.3 of Unreal Engine, Vulkan SM6 did not require GPU support for the VK_EXT_mesh_shader extension (e.g., GTX 10xx, RDNA1 models).
Starting from version 5.5.4, a project with SM6 enabled can’t load on anything older than GTX 20XX or RDNA2, which breaks compatibility with existing projects.

2

Just got this issue exactly. Is this a new requirement?

I have an Nvidia GTX 1070, so I guess it does not have the needed mesh shader extension (or it has an earlier version without the required features).

People are treating this as a bug (which it seems to be) here: Unreal Engine 5.6 startup Vulkan error and VK_EXT_mesh_shader