Fails to tabulate a very simple TSV file; still fails even when I specify the separator

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This plugin fails to detect the following very simple TSV as tab-separated:

0	VAL1	Some space separated text
1	VAL2	More space separated text
2	Some other val	More space separated text
3	Another space-sep val	More space separated text

When I explicitly configure the plugin to use only a TAB, it still can't figure out the file:

Using the latest Rider and plugin as of August 21, 2024.