Since Hifiasm-0.19.8 (r603):

1. Fixed several issues that may lead to segmentation fault.
2. To produce more T2T contigs/scaffolds, there are multiple new options that can keep telomeres at the ends of contigs/scaffolds, including --telo-m, --telo-p, --telo-d and --telo-s. For instance, using --telo-m CCCTAA for human genome assemblies.
3. Integrated --ctg-n to discard too small contigs.