This glitch uses a small redstone machine to move the rails back and forth quickly. This movement causes the game to think that the guides are still installed, but broken. This leads to the fact that they lose the shape of the object, while remaining positioned, duplicating them.
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However, this issue is Invalid.
Your game, launcher or server is modified.
If you can reproduce the issue in a vanilla environment, please recreate the issue.
Any non-standard client/server/launcher build needs to be taken up with the appropriate team, not Mojang.
A world which had previously been opened with a modified client might be corrupted. Please try reproducing the issue in a newly generated world.
Any plugin issues need to be addressed to the creator of the plugin or resource pack.
If you have problems on large servers like Hypixel, please contact them first as they run modified server software.
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Unable to reproduce the described issue in 1.21.1 Java and Bedrock versions. The duplication rail in the screenshot pushes the block behind it breaking the redstone dust above it and the rail.