Thats because your trying to goto a block that looks like it would be optimized out of existance. Since $data is a constant the optimizer components that look at switches are probably smart enough to notice that only the when (1) case will run and will replace the whole switch in the op tree with simply say 'one'; goto two;.
Disclaimer: I don't claim to have intimate knowledge of how switches are implemented in the optree or how the optimizer treats them. Take this explanation with a grain of salt, it may sound good, but it may also be flat out wrong.
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