Lintian tag information: desktop-entry-contains-unknown-key (type: warning)

Description (from lintian-explain-tags)

The key on this line of the desktop entry is not listed as being defined
by the FreeDesktop specification. It is also not one of the legacy KDE
keywords and does not begin with X-.

The key may have been misspelled.

The desktop-file-validate tool in the desktop-file-utils package may be
useful when checking the syntax of desktop entries.

Please refer to
https://specifications.freedesktop.org/desktop-entry-spec/latest/ar01s06.html
for details.

Visibility: warning
Show-Always: no
Check: menu-format

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