The runtime warning I saw seems to be fixed in macOS 26 beta 7

@Etresoft No, the decoded URL is not the same as the encoded URL. That's the whole point of my post.

@DTS Engineer It concerns SMB shares of NTFS volumes hosted on Windows PCs. The starting URL could for example be file:///Volumes/Videos/, but the resolved URL is file:///. This happens immediately after resolving the bookmark data, even if that data has been created in the same code context. To be clear, only in macOS 26.1. In older macOS versions the starting URL and resolved URL are identical. FB20917638 contains instructions and a sample project to reproduce the issue.

This bug seems to be fixed in macOS 26.2 beta 3.