"Ignore all" not working for "Sentence is over 40 words long"

Using LT3.1 on LO4.4.5.2, when I click “Ignore all” for "“Sentence is over 40 words long”, the wavy line disappears, and reappears after a few seconds.

Thanks for the report! With the next version (2015-10-05) this should be fixed. It will be available later today at Index of /snapshots/