Ah, true. Another bug from that broken drag system...
I've made some tests, and apparently it only happens when the fairings are attached to the probe, and when you detach them.
For example, it doesn't happen to that rocket:
View attachment 21750
But it does with that one, once fairings are detached:
View attachment 21752
Sadly there's not much we can do about it, hopefully this will be fixed on 1.5.