Are you referring to the Advanced Search form? I'm not aware of any recent changes to that form but I'm checking with our product team. We'll post an update once we have more information.
I am not sure if this is related but my search criteria/settings has always been the same for the last several years. However, since early this week, I have been getting from my feed jobs that are not a part of my search query. My focal is Web Development/Design but now I am getting about 40-50% copywriting jobs most of which do not have anything to do with web content or design or anything else related to web work.
I have contacted support about this 2-3 hours ago and even shared 3-4 links of job posting that should not be listed in my job feed. I have not heard back from them yet. I wonder if this new 'gradual rollout' have something to do with it. It's like somebody put the site together and still had a few screws left over.
If I hear back from them, I will try to remember to post back here.
Thanks for following up and confirming. I heard back from our engineers and they confirmed that no changes had been made recently to the character limit for the fields in the Advanced search.