qt.svg "could not resolve property: LinerGradient" log spam

[rm-rf-tux]

When using this specific icon theme, system logs are spammed a few times per second with these messages (repeated several times, so I only included one of each I could find, the list might not be exhaustive):

qt.svg: /home/lol/.local/share/icons/la-capitaine-icon-theme-0.3.2/actions/16x16/document-edit.svg:528:6: Could not resolve property: #linearGradient4566
qt.svg: /home/lol/.local/share/icons/la-capitaine-icon-theme-0.3.2/actions/16x16/document-new.svg:733:6: Could not resolve property: #linearGradient4538
qt.svg: /home/lol/.local/share/icons/la-capitaine-icon-theme-0.3.2/actions/16x16/edit-paste.svg:564:6: Could not resolve property: #linearGradient4588
qt.svg: /home/lol/.local/share/icons/la-capitaine-icon-theme-0.3.2/actions/16x16/dialog-ok-apply.svg:784:6: Could not resolve property: #linearGradient4554
qt.svg: /home/lol/.local/share/icons/la-capitaine-icon-theme-0.3.2/actions/16x16/document-share.svg:693:6: Could not resolve property: #linearGradient4532
qt.svg: /home/lol/.local/share/icons/la-capitaine-icon-theme-0.3.2/actions/16x16/draw-freehand.svg:556:6: Could not resolve property: #linearGradient4532

it seems like a very similar issue has already happened in the past (#228)
I am using Qt 6.8 and KDE plasma 6.2.3