error when using .merge(pairs)

[sofiapuvogelvittini]

Hi, I have been using the function scur.get_potential_auto_merge() to get pairs f neurons to be merged and then I merge them with .merge(pairs). It works well most of the time, but now I am getting this error "AssertionError: new_unit_ids should have the same len as merge_unit_groups. The output of pairs is [(520, 1001, (861,872)]. I can identify this units in the sorting object. Attahced the full error in a pdf.
Do you have any thoughts on what could be going wrong this time?

Thanks a lot!
merge_error.pdf

[sofiapuvogelvittini]

I solved it manually by merging each unit and assigning a new ID, like this
curation_sorting.merge([(520)],1008)
curation_sorting.merge([(861)],1009)
Could it be a bug in the merge function when handling multiple units?
Best!

[zm711]

I haven't seen the nested merge pairs before. Could you post a bit more of your script? And which version of spikeinterface you're using?