Silver-plated Pattern Coins: Should they be straight-graded or details-graded?

Noticed a Judd 236 half dollar just sold (12 Mar 19) by Great Collections. Coin is straight-graded PR61 Plated by NGC. See first pic below. Judd J-236 is the copper version of J-235 which was minted in silver. Nice liberty-seated design with shield to left of liberty and her right hand resting on ax of fasces. Spread-eagle reverse. Both J-235 and J-236 are relatively common for patterns. Still are 4-figure coins. Second pic shows an un-plated coin.

Neither Judd nor Pollack mention anything about plated versions of J-236. NGC has certified a couple more plated coins which were sold by Heritage in 2008 and 2009. The Heritage cataloger presumed they were plated outside the mint. I did some web searching and haven't found anything more about these plated coins. And I haven't found any plated J-236s certified by PCGS. However, PCGS has straight-graded plated Judd-1498 Barber dimes.

There are patterns for which only silver-plated examples are known. Example is Judd-1732 trade dollar (only two known). However, Judd mentions nothing about where the plating occurred. There are other examples: All known supposed Judd-1497 Barber dimes are actually silver plated Judd-1498s (minted in copper).

Appears that the grading services are giving plated patterns the benefit of the doubt or have a different standard for patterns. Submit a silver-plated, non-pattern large cent, and see what happens.

Anyone know if there is historical evidence that the mint silver-plated any patterns?

Cal