Mention out-of-sync internal_ids issue

What does this MR do?

Adding a known issue that popped up a few times now here in the hopes it might help some users self-service, or at least speed up resolution when Support is being engaged. Only took me 2 months to finally follow up on my promise to add this.

The "main part" of this is actually not here, because after struggling for an hour I decided that the actual solution/workaround was just too much and too specific for the docs. Instead, I heavily amended the linked issue: #352382 (closed) – everything after the horizontal line in the Workaround section is new and from me, so a mild "review" of that is welcome as well.

Related issues

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