Google will occasionally mark your comments as spam on its own and remove their visibility days, weeks, months or years after they were posted.
There is no way for blog admins such as me to disable this bug. I will restore your comments once I notice, but since I get no notifications about it happening it will not be instantaneous.
Please ping me if that happens and you wish your comment restored faster.
I'm sorry for continuing to use such a cancerous blog platform, but I'm not quite ready to pay the time and uncertainty-of-survival-of-the-new-choice costs of switching at the moment.