Hello ! My 2 cents here just in case. I had same issue, hdri backdrop sometimes work, and often not. I raised the hdri backdrop size as well AND, in the skylight contained into the hdri backdrop, i raised the sky distance threshold to 15000 as well. This one makes it work instantly, and consistently. Cool. i raised the cubemap resolution of the skylight to 2048 to get a more precise hdri conversion into lighting. Hope it helps !
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