Doesn’t remove old taxonomy

Hi,
I’m doing a Bulk Move By Custom Taxonomy.
I select the From category (left) and To category (right) and “Don’t remove them” for other terms as I have a handful of posts that have other terms.
It successfully adds the new taxonomy (right) but leaves the old one still there. It’s not a huge issue as it’s 7 out of 188 but not what I expected. I ended up running it again and choosing to remove the other terms and then manually reselecting those other terms for the 7 affected posts but seems odd to me that it didn’t work as expected.