API: Reduce volume of "continue format is changing" warning

API: Reduce volume of "continue format is changing" warning

It's excessively difficult to determine if the logs of people hitting
this warning are really going to be affected by the change or if they're
making queries where it won't actually matter.

Since 1.26 is coming soon, and with it the decision as to whether to
pull the switch on I984e6358, let's retarget the warnings to those cases
where it's possible it would actually break someone's code.

Change-Id: I91f170fd7d4c791ca8f5d3592c888700f4d5aa97