Doesn't work in LW2020+Octane 2020.1 anymore, I reported to LightMap guys but so far haven't got any response.
They have updated it for LW2020 but that works only with NATIVE render engine not with Octane anymore
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Works in LW 2019.1.5 so i suspect they just didn't upgrade LW2020 Environment light changes to sync with Octane also.
Send them message/report, hopefully they will answer.