Could you please confirm that '>6223 broken' means that 6.2.2.3 works correctly with H264 AAC,
both Main and High like before, in older versions (when set in VIP)?
ms-dfav
My NF default for series is AV1 + AAC and for movies H264 High + AAC
and of course all my NF Movies before 6224 worked with H264 High + AAC
So I tested only a movie + episode with SF 6223 with VIP Setting: H264,Main,AAC
Movie: Slingshot (via CA) with H264 Main + AAC

Serie: Halo.s01e01 (via CA) with H264 Main + AAC

But as you have already correctly noted, it must first be active in the VIP setting
(change in selection only is useless with SF >6220, if VIP setting is different)