Lose one rule occasionally when press "save" button

Hi, recently I find when I make several rules in one filter, then press save button, it saves, but has a chance to lose one of the rules. Not each time. I have to check which rule is lost and add it again and save it again, then it saves correctly.

Does anyone else find this?

mysql: 5.5.62
php: 5.6.38
ttrss commit: 643d1919cc27a80aff424970b337e83be72720d1

add update:

tt-rss is updated in 11.22, I will update to the latest commit and keep watching.

i dunno, never had this happen here. everything is possible but unless you can find a way to reliably reproduce this i won’t be able to help.