To recreate: Open a map and place a large amount of redstone lamps in a big square.
Note that the area covered by redstone lamps now appears on the map with the same color as orange terracotta.
Expected behavior: Redstone lamps do not show up on the map.
My understanding is that this was changed because someone had it marked as a bug that redstone lamps are transparent on maps. I would make the case that this should be reverted to the previous behavior and not be put into full release.
The redstone lamp was a very unique block for maps, in that it's the only transparent block that blocks light, and can be powered through. This makes it very useful for map display tech, chiefly, it allows a roof to be built above the map display to prevent undue light updates (lots of pistons on map displays). There are years of tech built on top of redstone lamps being transparent, and there's no alternative transparent map block that can do what it does.
Unless a new or different block(s) could inherit the map features of redstone lamps, this change will be very challenging for the field of map display tech. Alternatively, a middle ground that would actually open up new display tech would be to make it so that when the lamp is on, it shows on the map, but when it's off its transparent.
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Thank you for your report!
However, this issue is Working as Intended.
The report you have submitted is working as intended: see MC-124331.
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Consider the consequences of this change though. Most players won't even notice that their lamp post is a differently colored pixel on a map. For those of us who work on map displays, now everything is orange and has to be re-engineered because this was literally the only block in the game with this behavior.
Imagine if someone put in a bug report "Glazed terracotta pushed but not pulled by sticky piston" and someone decided "oh that's weird" and made it behave like a regular solid block. Most players who aren't trying to push or pull glazed terracotta wouldn't even notice, but everyone who was actually using the non-stick feature would notice immediately and be rightfully annoyed that the single block with that unique behavior is gone.
I figured the redstone lamp transparency was just another little not-so-obvious feature that they will sometimes throw in there for the tech people like the aforementioned glazed terra, mangrove roots, copper grating, etc. Very unfortunate to learn that it was just a bug.
MC-124331 was the report that described this behavior as a bug.