Hello !
I have the same issue. I can’t see anymore the parts I’m fixing (only the attachement point in some conditions).
I noticed it happened when I upgraded from KIS 1.4 to 1.5.
With KAS 1.5 & KIS 1.4, everything is Ok; but with KIS 1.5 the issue appears.
Note I upgraded KAS a few days before KIS (removing the old folder before, etc).
Downgrading back to KIS 1.4 fixes the issue.
I am on KSP 1.5, running on Linux (and the parts that didn’t show come from the MKS mod, among others).
(Sorry, I can’t provide screenshot nor logs, I just have my phone for a couple of days).
However, thanks for your awesome work