cron_next with time_t parameter produces next time which equals produced time.

[CasysWooks]

With the cronexpr string as shown below.

CronExpr String: */15 * * * * *

I tried to calculate the Next Cron Time from Timestamp below.

DateTime: 2023-04-06 16:24:15.001

The result confirmed that the same time came out as below

NextTime: 2023-04-06T16:24:15

Is this result a bug?