not working if google-tag-manager initialized before via script

I've developed a separate widget that can be installed on clients website.
And issue appears if clients have their google-tag-manager initialised already via script with the same containerId

Here is an example

const analytics = Analytics({
	app: 'vr-crm',
	plugins: [
		googleTagManager({
			containerId
		})
	]
})

And use it like this

analytics.track(
  'dayClickEvent',
  {
	  value: dayStr
  },
  () => console.log('analytics called dayClickEvent on ', dayStr)
)

And it outputs callback but never fires the event.
So i have 2 questions:
1st - is this expected behaviour?
2nd - is there any way to use already initialised google-tag-manager in Analytics?

And it works fine when i remove google-tag-manager <script> from my website

Start by reproducing the issue with the existing Google Tag Manager script loaded before the Analytics configuration, using the provided containerId and track call. Compare it with the case where the script is removed, then determine whether the Google Tag Manager integration can use the existing initialization and define completion by making the event fire in the pre-initialized case.