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The prepared list named its shader variants and nothing about where they came from, so an update that keeps the prepared shaders (shader_carry) kept the old list whatever seed the new kit writes: variants only the new seed names, from a newer pipeline list or a change to which variants are prepared, were translated when play first drew them. The existing identities do not cover this: nx2navi_xlate.id and identities.txt name translators, which decide cache keys and what is carried over, not which variants are listed. The list is now version 2 (runtime/prp_file.h): after the head come the sha256 of seed-programs.bin, the sha256 of seed-answers.bin and the translator identity, written by gfx_shader_prepare_seed; the three readers go through gfx_shader_prepared_read and still read a version 1 list. At an update step_shaders writes the seed first (prepare_shaders.py --no-run, about 4 s) and keeps the list only when its digests are that seed's (make_game.py seed_changed); another seed, or a list that does not say, is prepared again. Another translator alone still carries over: input ids do not depend on the translator, and preparing everything again for it is what carrying was made to avoid. Checked with tests/prp_file_check.py (the C layout against make_game's reader), three launcher tests, and the exe's --prepare-shaders on a seed without records in a folder of its own: the digests it wrote are those of the seed files, one byte more in the seed reads as changed, and after preparing again it does not. A version 1 list of 42,142 variants and the same list as version 2 are both read whole by --probe-prewarm. Co-Authored-By: Claude Fable 5.2 <noreply@anthropic.com>