Geth should handle genesis block with default syncmode #28222

System information

Geth version: v1.13.2

Expected behaviour

When running without specifying --syncmode=full (i.e. the default i.e. snap sync) geth should transition to full sync automatically for pre-genesis / genesis blocks.

Actual behaviour

Geth doesn't import the 1st block:

Ignoring payload while snap syncing number=1

Steps to reproduce the behaviour

Run geth without --syncmode=full on a new network