New York lost a congressional seat by falling 89 residents short. Given that the response window fell during the peak COVID crisis for NYC, it's hard to imagine it didn't have a negative impact on response rate.
And while the ACS annual surveys are considered accurate, what would be the right period for changing Congressional seat counts? It obviously can't be annual (since House terms are every 2 years).
[0] https://www.census.gov/programs-surveys/decennial-census/abo...
Except California, but, mostly, yes.
That is the most interesting thing that could happen at least.