We've got the exact same issue. We've discovered that when the system language setting is the same as the LANGUAGE tag in the manifest, together with setting DEFAULT and AUTOSELECT to NO, the custom NAME tag is shown. But we can't rely on the user having that exact same system setting, + no default tracks in the manifest at all.
Reference: https://developer.apple.com/forums/thread/650968
@Surendra7700 did you already got any solid answer somewhere else?
martz_trip
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@kcatigbe_nbcu have you had any luck with the radar with Apple? We're experiencing the exact same problem.