I am connecting to my network solutions email account using IMAP. I have generated some filters with large numbers of attributes using the quickfilters addin, with the option to prevent creation of duplicate filter. With this option it adds attributes to the existing filter. So the syntax of the filter looks ok. However firefox does not run the filter against all existing messages in the inbox if I run it against that. Also, the filter does not seem to filter all new messages that come into my inbox.. only some .. strange behavior .

Thunderbird 60.9.0, 64 bit on RHEL 8.0