If a spectator is in the range of a conduit or beacon, they will not obtain any effects players in creative / survival usually would. The conduit in particular, is frustrating since the conduit gives you underwater vision.
MC-152941
Players in spectator mode aren't affected by beacons or conduits
Open
2
(Unassigned)
Confirmed
Block states
Minecraft 1.14.1, Minecraft 1.14.2 Pre-Release 4, 1.16.3, 20w51a, 21w03a, 1.16.5, 21w06a, 21w08b, 1.17.1, 1.20.1
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It is intentional