The Faithful texture pack by Xmrvizzy doesn't appear in the marketplace unless I manually open it from the resource pack selection menu. My model is SM-P610 on Android.
I tested it more and it seems like it depends on how many blocks are being filled. It doesn't look like it goes beyond 2352 which is 48 and 49 in any direction
Yes, I'm able to use the fill command, but the radius I can use it is confined to what appears on screen. For example, if I want to fill in 2500 blocks (50x50) I can't unless all 2500 blocks are visible on screen.
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