Unlike a redstone lamp, copper lamps will not power adjacant redstone components if it is directly powered. See screenshot for more example.
IS THIS AN ISSUE?
As I am not a professional redstoneer, I cannot say if there are use cases for this, but I beleive that there are more use cases if it acts more like a redstone lamp. Since you could have a t-flip-flop that extends 1 more block, you could reach it deeper into redstone contraptions.
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is duplicated by 5
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Also, they are called "copper bulbs" rather than lamps
From the changelog on Copper Bulbs:
Does not conduct redstone power
Can confirm. Also relates to these tickets: MC-266054 and MC-266090