KLMinimizationFailedError: Quantiles must be sorted

[hyanwong]

I'm getting a KLMinimizationFailedError: Quantiles must be sorted error on trying to date the following inferred tree sequence (inference based on a simulated dataset):

import tszip
import tsdate

tsdate.date(
    tsdate.preprocess_ts(tszip.decompress("tsdate_failing.tsz")),
    mutation_rate=1.2e-08,
)

tsdate_failing.tsz.zip