Addendum to this. So much of the docket is under seal, but the government and Abrego Garcia have been going back and forth about the adequacy of the government's responses to discovery. The court has ordered the government to respond and cure the deficiencies, which is a prerequisite to obtaining sanctions.
They seem to have been through this drill several times.
So, sanctions seem to be on the table for repeated instances of disobeying court orders. The government has "incrementally" responded to each court order, not quite complying and offering new excuses and justifications for less-than-full compliance. For example, they originally resisted discovery not on state secrets, but some sort of separation-of-powers, this is the executive's sole prerogative shit. They didn't raise state secrets until the second or third go-round, and then they did it in a conclusory fashion..
So that seems pretty well teed up for something. What exactly remains to be seen.
Sanctions on the government are pretty rare because a) they're usually pretty good about obeying the rules and doing what they're supposed to and b) the government ostensibly represents the public interest and is not "made of money" (the usual or first sanction).
The quality of advocacy here is pretty low. The briefs may be decent, if disingenuous, but the behavior is really over the top. But exactly the kind of shit you expect from Trumpy lawyers.