Import results in loss of many feeds

[Korb]

I have a plain text file with 2456 feed links. I checked them with a python script and selectively manually, and made sure that they are alive. After that, I tried to import them into RSS Guard via Import Feeds / TXT files (one URL per line) (*.txt). After processing was completed (Operation result: Feeds were loaded), the application unlocked the Import from file button, but did not display how many feeds were imported from the file, and how many were currently selected. This is inconvenient, but I left all the feeds selected and added them to the application. After that, selecting all the feeds in the left panel, I saw that only 1894 feeds were imported, and 562 feeds were lost (23%, a quarter). At the same time, I have no idea which feeds were rejected during import, and why this happened.

Is it possible that one day the application will be more informative in terms of notifications during import of feed links? Because I couldn't make an OPML file from the links myself, the application simply reports OPML document contain errors. And the online validator finds errors in URLs that may not be errors from the RSS Guard point of view.

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Upd. I converted the list of links to an OPML file with escaped invalid characters in feed names and URLs.

Checking the feeds_corrected.opml with the online validator gave the result No errors were found. RSS Guard also found no errors, but imported only 1893 feeds, thus losing 563 feeds.
feeds_fixed.opml — No errors were found in the validator, but Operation result: Some feeds were not loaded properly. Check the log for more information in RSS Guard. 1892 feeds were imported, 564 were lost.

OPML files and logs (Google Drive, 7 MB).

For comparison, RSSOwlnix v2021-04-11:
feeds_corrected.opml — 2456 feeds imported, 0 feeds lost (Show Erroneous: 0)
feeds_fixed.opml — 2454 feeds imported, 2 feeds lost (Show Erroneous: 0)

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OS: Microsoft Windows 10.0.19045.5965
RSS Guard 4.8.5 (May 27, 2025)