Why does SMITH VD MA, JOHN read family SMITH MA with VD as a suffix? #573

When a name is written in one case, a particle that is also a credential (vd, mc) gets pulled out of the middle of a family name or a given part. That leaves a family name that isn't in source order. #554 settled that these words count as credentials after a comma. These shapes are different: one is before the comma, the other is in the given part's trailing slot. The writing that #554 treated as decisive (uniform case) is exactly where they break.

(mc reads exactly the same way in every row.)

• Before the comma: mixed case reads correctly today. 2.2.0 and 2.3.0 shipped family Smith Ma, suffix vd for it; Case and shape decide a bare ambiguous credential acronym (#289, #516) #530 fixed that, and PR fix(#544): a credential run keeps its ambiguous members #552 kept it fixed. In uniform case, VD is still peeled as a suffix from between two family words. The family SMITH MA is wrong under either reading: as a family name it should be SMITH VD MA, and as credentials it should be family SMITH, suffix VD MA.
• Trailing slot of the given part: VD attaches to the family in front of DOE, and that is out of source order. The comma-joined suffix PHD, MA splits a run that Should a credential run after a comma keep its comma when the last word is an ambiguous acronym? John Smith, PhD MEng reads first PhD, last John Smith #544 reads as one entry elsewhere. Under Should a particle that is also a credential (vd, mc) count in a credential run after a comma? #554's reading the expected result is suffix PHD VD MA.
• One name word before a family comma: VD stays behind in the family, cut off from the word it heads. That is neither reading: as a particle the family is SMITH VD MA (2.3.0's reading), and as credentials it is family SMITH, suffix VD MA, the way SMITH, PHD MA reads.
• Mixed case: Doe, Jane PhD vd Ma puts vd Ma in middle without a report. That's the aside from Should a particle that is also a credential (vd, mc) count in a credential run after a comma? #554.

Found while settling #554, with all rows measured on master fc682e3.