Unreal Engine crashes and prompts Assertion failed: Size <= BufferSize [File:D:\build++UE5\Sync\Engine\Source\Runtime\D3D12RHI\Private\D3D12Buffer.cpp] [Line: 608]
Requested lock size 75392 is larger than the total size 65536 for buffer ‘FParticleScratchVertexBuffer’.
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I have the same / similar issue. I use the Real-time Rain blueprint 
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I also have the same error: Assertion failed: Size <= BufferSize [File:D:\build++UE5\Sync\Engine\Source\Runtime\D3D12RHI\Private\D3D12Buffer.cpp] [Line: 608]
Requested lock size 131072 is larger than the total size 65536 for buffer ‘FParticleScratchVertexBuffer’.
In 5.3, the project worked, but when switching to 5.4, the following error occurred. Unfortunately, the logs do not show which particle causes the failure. The last entries in the logs about the soap are about loading fonts and then immediately such an error. I have a hundred unique particles in my project, I don’t know which one to delete so that the project starts.
Here the same, just moved to 5.4
Assertion failed: Size <= BufferSize [File:D:\build++UE5\Sync\Engine\Source\Runtime\D3D12RHI\Private\D3D12Buffer.cpp] [Line: 608]
Requested lock size 80000 is larger than the total size 65536 for buffer ‘FParticleScratchVertexBuffer’.
I think will show you if activate (install) Editor symbols for debugging
It was possible to solve the problem by successively removing particles from the map in 5.3.2 until the project started in and in 5.4. At this time, I will have to stay on the previous version, because besides this error, my engine also did not start due to a number of Skeletal meshes and animations. It was also necessary to remove all this. The transition to 5.4 turned out to be the most difficult in terms of losses, it has been updated for the past 4 years. I also see a number of blueprints with NPCs, objects, they also don’t work as they should, I’m trying to assemble the project, just a fatal amount of red lines… However, I’m already used to transferring the project to each version, so I’ll have to be patient and try to switch from 5.3 after some time .2 on 5.4 or most likely you will have to wait for 5.4.1 But I really wanted to try a new retarget, creating animations…
I’m having the same issue.
However, even after deleting all particles, the error still remains.