I am introducing searches using the "from:" feature, and they are not being remembered, not even as recent searches. Absolutely nothing.

All this is happening on the brand new version (as of 2019-01-28), and used to work in the older version.

Please, purely out of respect for my taking the time to write this bug report up, come back to me asap and tell me what is happening and what you are going to do to fix the problem.
Thanks,
m.