Description: The isoLIB parameter 'keep_old_reps=TRUE' should always prevent overwriting of Library 1 (old library) sequence grouping names when merging with Library 2 (new library). However, in some cases Library 1 sequence groups are not prioritized. This issue likely stems from misordering of VSEARCH --uc output file due to multithreading.
Description: The isoLIB parameter 'keep_old_reps=TRUE' should always prevent overwriting of Library 1 (old library) sequence grouping names when merging with Library 2 (new library). However, in some cases Library 1 sequence groups are not prioritized. This issue likely stems from misordering of VSEARCH --uc output file due to multithreading.