We migrated from version 1.6 to version 1.13 and noticed some weird changes in the names of the methods.
In v1.6 a method was named like this:
res, err := client.Groups().ByGroupIdGuid(idUUID).Get(ctx, nil)

In v1.13 it is now named like this:
res, err := client.Groups().ByGroupIdIdGuid(idUUID).Get(ctx, nil)

I also tried v1.10 which named them like this:
res, err := client.Groups().ByGroupsIdGuid(idUUID).Get(ctx, nil)

The different client versions were all generated from the same open api definition.

We personally prefer the naming scheme from version 1.6 since the others are just missleading.