I started troubleshooting my plugins and found that Rank Math 1.0.88.1 was the problem. I deactivated it and now Tables is working fine again.
I’m using 1.3.17 and I’m having similar problems. In addition to save not working. Duplicate works but only produces a copy with the same name but without any data. I’ve cleared the cache and deactivated and reactivated as described above. I’ve tried the different functions on multiple tables with the same results.