[RadeonSI][gfx10/navi] Kerbal Space Program crash: si_draw_vbo: Assertion `0' failed

(...)src/gallium/drivers/radeonsi/si_state_draw.c:1797: si_draw_vbo: Assertion `0' failed.

Happening when I'm launching game and trying to open spaceplane hangar or VAB. It doesn't happen with mesa 19.3.3, actual one in Debian unstable.

Tested with AMD_DEBUG=nongg (don't know if it's always actual), same crash.

apitrace

glxinfo:

Extended renderer info (GLX_MESA_query_renderer):
    Vendor: X.Org (0x1002)
    Device: AMD NAVI10 (DRM 3.35.0, 5.4.0-4-amd64, LLVM 10.0.0) (0x731f)
    Version: 20.1.0
    Accelerated: yes
    Video memory: 8192MB
    Unified memory: no
    Preferred profile: core (0x1)
    Max core profile version: 4.6
    Max compat profile version: 4.6
    Max GLES1 profile version: 1.1
    Max GLES[23] profile version: 3.2
Memory info (GL_ATI_meminfo):
    VBO free memory - total: 7661 MB, largest block: 7661 MB
    VBO free aux. memory - total: 8104 MB, largest block: 8104 MB
    Texture free memory - total: 7661 MB, largest block: 7661 MB
    Texture free aux. memory - total: 8104 MB, largest block: 8104 MB
    Renderbuffer free memory - total: 7661 MB, largest block: 7661 MB
    Renderbuffer free aux. memory - total: 8104 MB, largest block: 8104 MB

system info:

Debian Unstable
CPU:    i7 4790k
GPU:    Sapphire RX 5700
Kernel: 5.4.0-4-amd64 #1 SMP Debian 5.4.19-1 (2020-02-13)
Mesa:   20.1.0-devel (git-3199b8b9e7)
LLVM:   10.0.0~+rc2-2+b1
GCC:    gcc 9.2.1 "cc (Debian 9.2.1-25) 9.2.1 20200123")

Because I'm a noob, please tell me if you need more infos :)