Multiple pipelines created on dependabot's MRs

Recently we started using dependabot-standalone in one of our projects. For now it's only npm/yarn, dependabot runs on a daily schedule and opened 19 MRs so far. Everything works great, except there is one issue I cannot debug. Most of the MRs created by dependabot have multiple pipelines instead of a single one, which is how the project is configured and how it works for every other MR opened in the UI or using GitLab's rest API. Within those 19 MRs there are 13 with doubled pipeline, 4 with tripled and just 2 with a single pipeline, which is what I expect, since there is just a single commit in each MR. I tried diffing the metadata returned by GitLab about those duplicated pipelines, but they are nearly identical - they are created few seconds apart from each other or have the same created_at timestamp, main difference is ids. Is it a known issue? I couldn't find any related issues in this repository or anywhere else on the web.