==================== POC OUTPUT ====================
[POC] GL_RENDERER: ANGLE (Google, Vulkan 1.3.0 (SwiftShader Device (Subzero) (0x0000C0DE)), SwiftShader driver)
[POC] GL_VERSION : WebGL 2.0 (OpenGL ES 3.0 Chromium)
[POC] Dimensions : W=512 H=512 N=4  layer=1 MiB  total=4 MiB
[POC] 
[POC] [CONTROL] prime + 1 upload (prune threshold NOT met):
[POC]   layer 1: nonzero=0 marker(0xAB)=0
[POC]   layer 2: nonzero=0 marker(0xAB)=0
[POC]   layer 3: nonzero=0 marker(0xAB)=0
[POC]   total nonzero=0 marker=0
[POC] 
[POC] [TRIGGER] prime + 20 uploads (>=16 MiB -> prune fires on !valid() ImageHelper):
[POC]   layer 1: nonzero=0 marker(0xAB)=0
[POC]   layer 2: nonzero=0 marker(0xAB)=0
[POC]   layer 3: nonzero=0 marker(0xAB)=0
[POC]   total nonzero=0 marker=0
[POC] 
[POC] ---
[POC] ==> RESULT: NO LEAK OBSERVED
[POC]     Either the Clear was not pruned, or the underlying Vulkan ICD
[POC]     zeros device memory and the freed VMA block was not recycled.
====================================================

STATUS: NOT REPRODUCED
Full log: /tmp/chrome-poc-1894.log