[REG 6.5.3 - 6.6.0] Massive memory leak on WebEngineView resizing

Here is massive memory leak on macOS on resizing WebEngineView.
Can be reproduced e.g. with standard Quick Nano Browser example.

See attached screen recording Screen Recording 2024-04-12 at 21.05.10.mp4

Note: it doesn't depend on RHI, reproduced both with OpenGL and Metal.