A CRLF file re-CRLF'd (e.g. sed adding \r to already-CRLF lines) yields \r\r\n; the old _split_lines left a stray \r that split into a blank line between every line, so parse_boot_menu/settings/lint saw a garbled file and returned nothing. Now collapse any run of CR before a newline. Also re-deployed a clean-CRLF startnet.cmd into the live boot.wim (the earlier sed-based deploys had doubled the CR).
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