KSP v1.5.1.2335
Making History v1.5.1
KER 1.1.5.4

Issue: When adding pods from the Making History expansion, KER does not account for them and thus doesn't adjust delta-v calculations or weight calculations and the like.

How to reproduce:
Fresh install of KSP from Steam, KER 1.1.5.4 from here. Load up game, load save, go to VAB. Add tank and engine, check dV calcs. Add normal command pod, see values adjust. Add round Making History pod, calcs do not adjust.

I will check this myself later on tonight, but I'll ask now: does it do this if you start with the pod? Is the pod the root part? those pods have a built-in separator so if they're not the root the game assume it's jettisoned immediately.

So, no it was not the root part, it was added after the fact. Re-rooting it to the pod it'll show proper dV for the pod, even if it was not the first part. But once the part is not the root part, it stops calculating it as part of the weight of the craft.

appreciate the help jrbudda!