LineMarkerProvider Icon is not shown

Hi, i'm working on an Android Studio Plugin, where i use a LineMarkerProvider to show an icon(for now a Jar Icon) with an action next to a line with the word "deepLink". When i use the gradle plugin and set version '2019.1.3', everything works fine.

But when i use version '192.7142.36' (to target Android Studio). A small dot is shown instead of my icon. When i hover over the dot, i get the tootip and action and everything works as expected. The Jar Icon is 16x16 png, but i tried various icons.

Here is my LinemarkerProvider:

class DeepLinkLineMarkerProvider : LineMarkerProvider {

    override fun getLineMarkerInfo(p0: PsiElement): LineMarkerInfo<*>? {
        val element = p0
        if (element is XmlTokenImpl) {
            when (element.text) {
                "deepLink" -> {
                    return LineMarkerInfo(element, element.textRange,
                        SimpleIcons.LINK, { "Start a deepLink" }, { _: MouseEvent, _: XmlTokenImpl ->
                          
                        }, GutterIconRenderer.Alignment.CENTER
                    )
                }
                else -> {
                    return null
                }
            }
        } else {
            return null
        }
    }

 
}

What could be the reason that my icon is not compatible with this version?