Persistent "Could not parse into format" error

[brightshine1111]

I have the working hours plugin installed on my Jenkins master, and whenever the local time is outside of the configured working hours, the log gets filled with hundreds of these error messages:

Could not parse into format HHmm
Could not parse into format HHmm
Could not parse into format HHmm
Could not parse into format HHmm
Could not parse into format HHmm
Could not parse into format HHmm
Could not parse into format HHmm
Could not parse into format HHmm
Could not parse into format HHmm
2021-02-25 23:33:48.642+0000 [id=133]    INFO    o.j.p.w.WorkingHoursQueueTaskDispatcher#log: Blocking item 345921
021-02-25 23:33:48.643+0000 [id=133]    INFO    o.j.p.w.WorkingHoursQueueTaskDispatcher#log: Blocking item 345922

I'm running the latest available version of the working hours plugin (1.1) with Jenkins 2.263.3, but this has been an issue for months now.

My configuration for the working hours plugin looks like so:

I've tried changing 00:00 to 0:00, no change in the logging. The working hours plugin is working as expected - it's blocking jobs outside the configured working hours - yet it's still spamming the system log with these parse errors.

[yo-cleon]

I'd got the same problem. Is there any solution? Jenkins version 2.332.2, plugin version 1.1