Broken export file when level > 6.0

Hey there!
I'm struggeling to export a 360 video from Premiere, when the level in the encoding settings is set to 6.1 or 6.2. The exported file just can't be opened, saying the format is not supported by the player.
When I set the level on 6.0 though, the exported file works perfectly! But that automatically decreases the size to be smaller than 8k, so no option in this case.

Does anyone had similar issues, or might know a work around I could try?

Thanks already for the answers!

Attach are the two export settings I tried. But I can't get to 8k without having theh broken file.