sharepoint online – AAD User Guests, SecurityGroups, and Unique Permissions

We have a tenant with about 60 external guest users (added as # EXT # in AAD)
In order to control and manage these users, I put them in O365 security groups after accepting the invitation.

These groups have access to specific libraries on different SPO team sites.

-> As a member of SG_EXAMPLE1, I still do not have access …

I've broken the inherited ofc permissions.

Am I wrong? Or does it take more than 1h to crawl?