Is this behaviour predictable? In other words: if you would create another branchline from the same mainline revision, are the same changes missing? Are the missing changes all from the same revision of the mainline or do they come from a merge of another branch?
Hopefully this helps to pinpoint the issue.
I've created 3 branches, from the same (mainline) revision. All have the same behaviour. Seems like it's one specific revision missing each time.
Never used any branches before, so it cannot be from a previous merge.
Its not really an issue for me in this project, but I ran into this by accident, and was wondering if anyone else ever ran into the same issue.