I know this is a duplicate but all other posts are outdated.
Steps of the example :
1) Command block in the overworld (ticking area)
2) Put "/execute @a ~ ~ ~ detect ~ ~-1 ~ grass 0 say Grass" to check if a player is stepping on grass.
3) Put on repeat mode
4) Find a position where you step in grass in the overworld
5) Go to that position in the nether
Result :
The command block finds grass underneath the player and says Grass even in the nether where there isn't any.
Expected result :
The command block shouldn't find Grass and not displaying grass.
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I'm afraid we cannot help you with issue on Windows Phone. This platform is no longer supported, see https://www.minecraft.net/en-us/article/important-news-regarding-minecraft-mobile
Please don't just say something doesn't work. Always say what actually happens and what should happen. Please update the description above and use this format:
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Expected Results:
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This ticket has been temporarily closed as Awaiting Response. It will automatically reopen when you add information. Please follow the format shown and include all sections (steps, observed, expected). Tickets that do not contain all of the requested information and complete steps to reproduce the issue may be closed as Incomplete. For more information please read the Bug Tracker Guidelines.