This was initially reported in VR but the leak happens in a non-VR setup and environment. GPU utilization jumps to 84% in 4.23.1 and 98%+ in 4.24.3, 4.25, and 4.26. Tested GPUs were GTX 980 and GTX Titan.
Attached is a repro project that has this setup.
This was reported and tested in 4.24.3 (CL-11590370). This was reproduced in 4.23.1 (CL-9631420), 4.25 Preview 2 (CL-12055273, and Main) 4.26 (CL-12063615)
Results: Memory leaks incredibly fast
Expected: Memory does not leak
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There's no existing public thread on this issue, so head over to Questions & Answers just mention UE-90533 in the post.