bug#54204: mumi search by date provides unexpected results

[kiasoc5]

The date search seems to mess up other filters as well:

date:1m..now is:open

https://issues.guix.gnu.org/search?query=date%3A1m..now+is%3Aopen

Here are 2 wrong results:

56512   URLs in coreutils manuals documentation should use HTTPS        Tue Jul 
12 07:19:25+0200 2022   Done
15284   patchwish: make the (name) field optional       Fri Sep 06 
11:06:27+0200 2013   Open

First issue is closed, failing is:open filter
Second issue is older than 1 month from now, failing date:1m..now filter