As noted in T309890#7986745, comment signatures are rounded down to the nearest minute, so saying a comment was posted "X seconds" ago is usually misleading, for example this comment that was just posted:
{F35215947}
Options:
* Find a way to get MW's relative timestamp library to only go to minute-resolution
* Special case any relative timestamp less than 60-120 seconds as 0 seconds, or a special message "a few seconds ago" like Flow
=== Behavior
1. Publish a new comment or new topic on a talk page, using any editing interface (e.g wikitext editor, New Topic Tool, Reply Tool, etc.)
//Actual//
2. ❗️Notice the timestamp within the "latest comment indicator" that appears beneath BOTH the page title and within each section's Topic Container shows a time that could lead you to question whether it reflects comment/topic you've just published
//Desired//
2. ✅ Notice the timestamp within the "latest comment indicator" that appears beneath BOTH the page title and within each section's Topic Container reads `Just now` whenever a new comment or new topic has been published within the past 2 minutes (120 seconds), **regardless of the editing interface used to publish said comment and/or topic.**