UPDATE: Bug seems to be fixed with patch 1.30, finally. Now the buff is removed on combat end and is reapplied on combat start. Mod for disabling the glow effect is updated for patch 1.30 and 1.31. The patch 1.30/1.31 version also works for GOTY patch 1.31.

UPDATE: Next-gen version added

Fix Euphoria Mutation
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Fixes a bug with the mutation "Euphoria" from Blood & Wine.

Without fix the buff is removed on combat end and is never reapplied. You need to reequip the mutation to get it working again. With this fix the buff is no longer removed on combat end.

Added a version with disabled on-hit glow effect only

Installation
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extract contant of the archive into the folder ...\The Witcher 3 Wild Hunt\mods