The following is based on a decompiled version of Minecraft 1.9 using MCP 9.24 beta.
The reason for this is that the methods net.minecraft.client.Minecraft.sendClickBlockToController(boolean) and net.minecraft.client.multiplayer.PlayerControllerMP.onPlayerDamageBlock(BlockPos, EnumFacing) do not test if the player is in spectator mode.
⚠️ Please do not add Affected Versions to resolved reports.
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Confirmed for 14w21b