Duplicate XEC branch on usher

[xz-keg]

@AngieHinrichs, there seems to be a second XEC branch on recent usher trees derived via KP.3 plus multiple flip-flops.

It eventually result in same mutations as XEC and starts attracting XEC seqs. Both XEC.2 seqs and XEC+Orf1a:A599T seqs are attracted.

This needs fix.

https://nextstrain.org/fetch/genome-test.gi.ucsc.edu/trash/hgPhyloPlace/subtreeAuspice96_genome_test_3d266_cb7590.json?label=id:node_5762563

[Over-There-Is]

And all XEC.2 sequences are placed on it and not identified as XEC.2.

[AngieHinrichs]

Thanks for reporting that! Should be fixed in tomorrow's build (2025-01-24).