Can't upgrade to 2.3.4 "Invalid icon variant: duo"

Hey y'all,

tried to upgrade both via the ACP and via CLI, but always get this error:

Code:

InvalidArgumentException: Invalid icon variant: duo src\XF\Service\Icon\UsageAnalyzerService.php:675

#0 src\XF\Service\Icon\UsageAnalyzerService.php(898): XF\Service\Icon\UsageAnalyzerService->recordIcon('javascript', '8b5edf3858b6635...', 'sprite', 'duo', 'fa-times-circle')
#1 src\XF\Service\Icon\UsageAnalyzerService.php(301)...

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