Breaking redstone near rails changes rail layout

[badvision]

Expected behavior

After placing rails the way I want them, I expect that their layout/orientation should not be changed when breaking unpowered redstone next to them.

Observed/Actual behavior

What happens in this case is the rails get changed to an S-shape. I understand that switches can be used to change rails, but I don't expect that breaking unpowered redstone should trigger the logic for this. Also, I don't think that redstone state changes should affect rails that do not have any bends in them, but I am not 100% clear on the vanilla behavior either, so some of that could be a "me" problem.

Steps/models to reproduce

Create something like the following, then break the redstone. Depending on where the redstone is you might see it change, you might not. It's rather odd, TBH. When I first noticed it, the redstone was on a block lower than, but still adjacent to, the rails.

Plugin and Datapack List

No plugins needed to reproduce this issue.

Paper version

Paper version 1.21.4-138-main@5395ae3 (2025-02-02T21:42:11Z)

Other

No response

[KioProject123]

Maybe you can try testing it in single player.

This is the case in single player:

[badvision]

Hmm, k. It just seems like a bug but not your bug I suppose. Anyway, if this is the same as vanilla then sorry for the noise.

[badvision]

After some additional review I think this is related to the quasi-connectivity redstone logic, where an item affected by redstone is updated when there is any block state change next to it. Weird but probably a relic from a hacky work-around to support doors with switches over them originally.