Video web is not deleted if source video has no audio

Hi,
My instance (6.3.3) is setup with :
« Web Videos enabled » deactivated.
« HLS with P2P support enabled » activated.
« Split audio and video streams » activated.

When I upload a video with audio, « Web Video » is created then different resolutions files according to my setting and audio only track, then « Web Videos » is deleted. Everything seems fine here.

When I upload a video without audio, « Web Video » is created then different resolutions files according to my setting, but no audio only track (make sense), then Web Videos is not deleted.
Is not deleting « Web Video » intended because no audio only track was created so maybe something went wrong or is it a bug due to audio transcode failing ?

Thanks for all the work put in this very nice software.