Versions in DataDog/integrations-core are not found by Renovate github-tags datasource

[at-wat]

datadog-agent-alpine/renovate.json

Lines 17 to 27 in 9b02a20

	{
	"fileMatch": [
	"^Dockerfile$"
	],
	"matchStrings": [
	"ARG DATADOG_INTEGRATIONS_CORE_VERSION=(?<currentValue>.*)"
	],
	"datasourceTemplate": "github-tags",
	"depNameTemplate": "DataDog/integrations-core",
	"versioningTemplate": "semver"
	}

Versions in DataDog/datadog-agent are found, but DataDog/integrations-core are not.
Renovate log:

DEBUG: Found no results from datasource that look like a version (DataDog/integrations-core)(dependency="DataDog/integrations-core")
{
  "result": {
    "sourceUrl": "https://github.com/DataDog/integrations-core",
    "releases": []
  }
}

integrations-core actually has tags in the same format as datadog-agent.
https://github.com/DataDog/integrations-core/tags
https://github.com/DataDog/datadog-agent/tags

[at-wat]

The behavior is not changed by swapping the order of regexManagers.

[at-wat]

It seems like a bug in renovate bot. It can be worked around by using git-tags datasource instead of github-tags.