My understanding standing is that the Congress under the AoC at the time was involved in drafting and pushing forward the new Constitution which was allowed by the AoC so not sure I see any issues.
The original mandate of the Constitutional Convention was merely to amend the AoC. In a sense, the Constitutional Convention was a runaway convention in that it greatly exceeded its original authority when it scrapped the idea of amending the AoC and decided to draft an entirely new Constitution.
The runaway convention experience of 1787 concerns defenders of the U.S. Constitution today. If a convention to amend the AoC could end up scrapping and replacing the AoC, then a similar modern-day Constitutional Convention with the limited authority to amend the U.S. Constitution could end up scrapping the U.S. Constitution.
I’ll touch on that subject and more in subsequent posts.