I have had an automation setup to set the Organization based on the reporters email domain. I have pre-setup all the organizations named using the domain names that I expect tickets from, i.e. "companyone.com", "companytwo.ca", "companythree.org", etc.

This automation has generally worked well, but sometime mid-to-late last year, one domain started causing issues and instead of assigning tickets to "companyone.com" it starting assigning those tickets to an organization named "companone" without the TLD ".com"
I haven't changed anything with the organizations or automation settings and other domains still work as expected. It seems to just be one domain.