There's probably more blocks that rails cannot be placed on, but could by world generation, but we don't have time to find more of them.
Normally, rails cannot be placed on dirt paths as it's not a full block. However, if a mineshaft generates near a village, the rail(s) can generate(s) on the dirt path(s). Now, this is practically impossible in normal world because villages are on ground structures and mineshafts are underground structures, however this can be reproduced in a superflat world.
1.21.1
Seed: -9223332948529622761
World type: Superflat, modified version of Overworld preset: 79*minecraft:air,minecraft:bedrock;minecraft:plains
Coordinates: /execute in overworld run tp 136 16 348Similar to MC-273441, this in theory can happen in the normal world, there're 2 ways this can happen, both are very very rare in the normal world and we can't find it yet.
1) (My way) A non-desert village somehow not only generates underground but also low enough to be in the levels of mineshafts spawning, then a mineshaft needs to spawn next to a village such that one of the rail in mineshaft spawn on a dirt path in village. Now, we're not sure if underground village is intended of not and we cannot find any open issues about underground village, the closest bug report we can find is MC-240953, however this doesn't really matter bc of the 2nd way.
2) (NguyenFranky's way) A non-desert village spawns on the boundary of a badlands biome, which then a surface mesa mineshaft spawn near it, which then a rail is placed on a dirt path. This way doesn't require an underground village and is much more simple than the 1st way.
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After consideration, the issue is being closed as Won't Fix.
Please note that this is not the same as Working as Intended, as this bug report correctly describes behavior in the game that might not be the intended or desirable behavior, but it will not be fixed right now. Sometimes, this is because the issue reported is minor and/or impossible to change without large architectural changes to the code base.
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Brain, I don't think you need an underground village for the rail to spawn on the dirt path in normal generation. Yes, mineshafts can only spawn underground but that's only true for normal mineshafts. Mesa mineshafts on the other hand can spawn on the surface, so you don't need an under village. All you need is a non-desert village to spawn in the boundary of a badlands biome (since cannot spawn directly in badlands). Then a surface mesa mineshaft spawn near that village, which then a rail can spawn on top of a dirt path.