No beta with gene_mode = F

[jsalignon]

Hi there,
I find that when using

sleuth_prep(gene_mode = F, ...)
sleuth_results(pval_aggregate = T)

I get no output for b, and many other columns (se_b, mean_obs, ...), while it should be there according to the documentation: https://www.rdocumentation.org/packages/sleuth/versions/0.30.0/topics/sleuth_results

However, when using the old method:

sleuth_prep(gene_mode = T, ...)
sleuth_results(pval_aggregate = F)

Then it works and I get all the expected columns.
Or maybe I am missing something obvious here.
Best,
Jerome