Feed category 'Software' is never displayed after login

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Describe the problem you’re having:

After logging-in to tt-rss, the feed category ‘Software’ is never displayed in the feed list. All other categories are displayed. Reloading the page fixes the issue. The bug only happens on the first login in a newly opened browser window.

The setting “Hide read feeds” is not enabled.

Bug demo: TT-RSS Category bug - YouTube

If possible include steps to reproduce the problem:

tt-rss version: v20.01-076c5382f
Platform: DigitalOcean, ubuntu.18.04, PHP 7.2