Hi,

I am living with this bug since a long time, I thought I was asking 
maybe something very special.

But then I find on a org-capture that goes to an inbox entry:

1. if prepend is nil, does not work on the first time (?)
2. works when number of entries is greater than 1
3. never works when prepend is t

Find attached org-capture-cookies-bug.org which I think it makes it very 
easy to reproduce. Tested with ~emacs -Q~ with orgmode 9.7.10 and 
emacs-30 branch with commit 44c2614

Cheers,
pinmacs

[1] I mean, like running this function: (org-update-statistics-cookies nil)