Hair not rendered with virtual parents

Not very problematic, virtual parents are only useful to tweak the details of a groom with clumping and kinks.

.blend file:
default cube : blendluxcore_virtual_parents.zip
dog : salukhead.zip

Steps to reproduce:

• take default cube
• add particle system
• change to hair
• set children to interpolated
• put "virtual parents" to something other than 0, like 0.1

Screenshots or rendered images:

Error message from Blender console:
(output from luxcore when switching to rendered view, nothing that looks like an error)
[LuxCore][662.860] Film resolution: 562x686 [SDL][662.860] Film output definition: RGB_IMAGEPIPELINE [image.png] [SDL][662.860] Image pipeline: film.imagepipelines.000 [SDL][662.860] Image pipeline step 0: NOP [SDL][662.860] Image pipeline step 1: TONEMAP_LINEAR [SDL][662.860] Film output definition: RGB_IMAGEPIPELINE [RGB_IMAGEPIPELINE_0.png] [SDL][662.860] Film output definition: ALBEDO [ALBEDO.exr] [SDL][662.860] Film output definition: AVG_SHADING_NORMAL [AVG_SHADING_NORMAL.exr] [LuxRays][662.860] OpenCL support: enabled [LuxRays][662.860] OpenCL Platform 0: NVIDIA CUDA [LuxRays][662.860] OpenCL Platform 1: Intel(R) OpenCL HD Graphics [LuxRays][662.860] CUDA support: enabled [LuxRays][662.860] CUDA support: available [LuxRays][662.860] CUDA driver version: 11.30 [LuxRays][662.860] CUDA device count: 1 [LuxRays][662.860] Optix support: available [LuxRays][662.875] Device 0 name: Native [LuxRays][662.875] Device 0 type: NATIVE_THREAD [LuxRays][662.875] Device 0 compute units: 1 [LuxRays][662.875] Device 0 preferred float vector width: 4 [LuxRays][662.875] Device 0 max allocable memory: 17592186044415MBytes [LuxRays][662.875] Device 0 max allocable memory block size: 17592186044415MBytes [LuxRays][662.875] Device 0 has out of core memory support: 0 [LuxRays][662.875] Device 1 name: NVIDIA GeForce GTX 1070 with Max-Q Design [LuxRays][662.875] Device 1 type: OPENCL_GPU [LuxRays][662.875] Device 1 compute units: 16 [LuxRays][662.875] Device 1 preferred float vector width: 1 [LuxRays][662.875] Device 1 max allocable memory: 8192MBytes [LuxRays][662.875] Device 1 max allocable memory block size: 2048MBytes [LuxRays][662.875] Device 1 has out of core memory support: 0 [LuxRays][662.875] Device 2 name: Intel(R) UHD Graphics 630 [LuxRays][662.875] Device 2 type: OPENCL_GPU [LuxRays][662.875] Device 2 compute units: 24 [LuxRays][662.875] Device 2 preferred float vector width: 1 [LuxRays][662.891] Device 2 max allocable memory: 6490MBytes [LuxRays][662.891] Device 2 max allocable memory block size: 3245MBytes [LuxRays][662.891] Device 2 has out of core memory support: 0 [LuxRays][662.891] Device 3 name: NVIDIA GeForce GTX 1070 with Max-Q Design [LuxRays][662.891] Device 3 type: CUDA_GPU [LuxRays][662.891] Device 3 compute units: 128 [LuxRays][662.891] Device 3 preferred float vector width: 1 [LuxRays][662.891] Device 3 max allocable memory: 8192MBytes [LuxRays][662.891] Device 3 max allocable memory block size: 17592186044415MBytes [LuxRays][662.891] Device 3 has out of core memory support: 1 [LuxRays][662.891] Device 3 CUDA compute capability: 6.1 [LuxRays][662.891] Creating 12 intersection device(s) [LuxRays][662.891] Allocating intersection device 0: Native (Type = NATIVE_THREAD) [LuxRays][662.891] Allocating intersection device 1: Native (Type = NATIVE_THREAD) [LuxRays][662.891] Allocating intersection device 2: Native (Type = NATIVE_THREAD) [LuxRays][662.891] Allocating intersection device 3: Native (Type = NATIVE_THREAD) [LuxRays][662.891] Allocating intersection device 4: Native (Type = NATIVE_THREAD) [LuxRays][662.891] Allocating intersection device 5: Native (Type = NATIVE_THREAD) [LuxRays][662.891] Allocating intersection device 6: Native (Type = NATIVE_THREAD) [LuxRays][662.891] Allocating intersection device 7: Native (Type = NATIVE_THREAD) [LuxRays][662.891] Allocating intersection device 8: Native (Type = NATIVE_THREAD) [LuxRays][662.891] Allocating intersection device 9: Native (Type = NATIVE_THREAD) [LuxRays][662.891] Allocating intersection device 10: Native (Type = NATIVE_THREAD) [LuxRays][662.891] Allocating intersection device 11: Native (Type = NATIVE_THREAD) [LuxCore][662.891] Configuring 12 CPU render threads [LuxRays][662.891] Preprocessing DataSet [LuxRays][662.891] Total vertex count: 24 [LuxRays][662.891] Total triangle count: 12 [LuxRays][662.891] Preprocessing DataSet done [LuxRays][662.907] Adding DataSet accelerator: EMBREE [LuxRays][662.907] Total vertex count: 24 [LuxRays][662.907] Total triangle count: 12 [LuxRays][662.907] EmbreeAccel build time: 0ms [Engine/Viewport] Pausing session Loading input Resolution: 562x686 Initializing device=CPU, version=1.4.1, msec=0.6399 filter=RT, msec=14.3503 Denoising 100% msec=411.396 Saving output

OS: Windows 10
Blender version: 4.0.2
LuxCore version: BlendLuxCore 2.8 alpha 1