Why would Links work differently than setting a predecessor?

Why would my Gantt chart work differently when creating a SF Link than when I add a predecessor using the inline editor?
I can’t figure it out. :frowning:

Edit
I forgot to say that in the second case, a Link delete and a Task update event is triggered for some reason.

Hello Subri,
It is a known issue that the previous values are not saved. The bug was fixed in the 7.0.13 version:
https://docs.dhtmlx.com/gantt/whatsnew.html#7013
Here is the snippet where you can test how it works:
https://snippet.dhtmlx.com/5/f431dfce4

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Thank you for the clarification!