We have a setting that is "WHEN=" since "when" is such a common word we try to find the description with the Exact Text: syntax description ~ "\"when=\"" this returns the same number as description ~"when". The "=" does not show up as a reserved symbol but since it is an operator, we think it is being ignored.
We had a similar issue with the term "update_move" the "_" acted like a wild card even though it was not listed as a wild card this search resolved that description ~ "\"update_move\"" but we are not having the same luck with description ~ "\"when=\""
Since there are 9,800 + results, it is not practical to read through them all.