Filter connection list desappears

The filter connections list while editing a filter is empty and left a big blank space, see file attached.

It appends on every filters in every files I have tested.

Inkscape Version: 1.0 (4035a4fb49, 2020-05-01)
Operating System: Debian GNU/Linux Testing bu inkscape unstable package installed for 1.0. (but bug is also reproducible on Windows).

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