Missing buffer in bufler (fundamental-mode?)

[indigoviolet]

I'm still trying to make sense of bufler-groups, so this might be a bit confused, but I notice that one specific kind of buffer is completely missing from my Bufler, even using the default bufler-groups.

The missing buffers are ipynb notebook buffers from ein: they have names like #<buffer *ein: http://127.0.0.1:8888/scratch.ipynb*> (output of (current-buffer)). I checked that they aren't file backed ((bufler-group-auto-file (current-buffer)) is nil).

I tried introducing a (group (name-match "*Ein*" (rx bos "*ein"))) into the Special subgroup, but it doesn't capture them.

Other ein buffers, for example #<buffer *ein:notebooklist http://127.0.0.1:8888*> do get shown and organized correctly.

Ibuffer does show these buffers.

Any ideas?

Edit: it actually seems like all fundamental-mode buffers are missing. I can't seem to capture them using a mode-match either..

[indigoviolet]

Never mind, just discovered bufler-filter-buffer-modes