This bug is probably VFX related and seems to have been introduced with the Year 4 2.2 patch, which fixed a number of issues with Echo's Yokai - such as players being able to see the cloaked drone ...

Ubisoft have detailed the thinking behind the big changes coming to Rainbow Six Siege in the upcoming Operation Para Bellum season, which includes buffs for Echo’s Yokai drones.As part of their ...