PXE boot OSD connects to Internet-only Management Point. A bug?

So here is the deal: SCCM registers the Management Points to be used in DPs PXE in a Registry file, it is done in alphabetical order (or install order), so all PXE boots will always connect to the first MP (Microsoft, WTF?). In my case, the first is an INTERNET
ONLY MP, why would PXE Booted OSD connect to that? Brrr..
Solution is to edit the registry, put the MPs in the right order and then it works like a charm.. until some SCCM maintenance task overwrites it with the default MP list, including internet only MP as first.
MPs don't respect boundaries and I cannot just block the ports (OSD will be slow, it first tries to connect to the internet MP, times out, then uses the next one).
A) This behaviour is a bug. PXE Boot should NEVER connect to Internet Only MP (OSD is not supported for IBCM).
B) Does anybody know what maintenance overwrites the DPs registry key "ManagementPoints"?
I cannot just use one MP. All external MPs are configured for internet only, internal MPs are configured intranet only.
Ideas?

The distribution manager on the site server is the component that populates the MP list on the registry of DP/PXE.
Dist mgr currently writes all the MPs and does not filter-out the internet-facing MPs.
Even if you manually edit the registry on the DP, dist mgr will over-write it the next time it updates the DP. You can try to put an ACL on the registry key which prevents the site server from updating it. However, the DP will never get updated by the site
for other things.

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