After blending a world from 1.17 to 1.18, dungeon spawners don’t load with a spawn egg in them.
As you probably know, dungeon spawners are always supposed to spawn in hostile entities.
It ended up with no entity spawning and no spinning mob animation inside. (Empty)
If there are any old 1.17 worlds with unloaded dungeons that you have near the blending line that you could load up, or go onto a device without 1.18 installed, and get a world loaded with a dungeon outside the “blending boarder”, and update it to 1.18, add blending, and there. If you want a world with that my seed was -955714010 at -26 -51 26.
Extra info if needed: The dungeon wasn’t a full cube shape with blocks above and below where they should be, like random blocks jutting out. I made a new world with the same seed just off of 1.18 and it looks normal, it was also a zombie spawner. I made a post on Redit with some of the images here:https://www.reddit.com/r/minecraftbugs/comments/r65l30/bedrock_118_zombie_spawned_not_working_with_extra/?utm_source=share&utm_medium=ios_app&utm_name=iossmf As I said before, probably a blending issue because of the weird shape. Third image on full 1.18 seed, the rest with blending.
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I too have a dead spawner after the world upgrade to 1.18. This was a Realms world. After installing 1.18.0.02 for Android the spawner went dark. I have a backup made pre-upgrade that can be used for testing.

If I close and later reopen the affected Realms world, the spawner is back to normal. When I leave the area and go a considerable distance away and then return, the spawner is dark when I return.

For me it isn’t a realms world, idk anything about realms though. It was also just empty when I found it, and it still is. Likely to blending because the dungeon wasn’t a cube like normal. It looked like the game tried to shape it like a cave inside because the blocks were out of place.

Thank you for your report!
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