Custom audience ids change?

Hello,

We are not able to set custom audiences using API

Everything was working fine ~14 hours ago but on some point custom audience ids changed and updating custom audience fails.

After checking the current values I noticed (for example)

https://backstage.taboola.com/backstage/api/1.0/giveitlove-sc/campaigns/4594930/targeting/my_audiences

The value in "collection" array used to appear as string "226875" and now its a number 1642268.
The new id is not in a dictionary we are getting from /universal_pixel/custom_audience_rule

This change is permanent and if so where we can get new ids?

Thanks
Michael