[bugs] I can't edit a repetition

Hello,

After creating an appointment with repetition, I can't edit the repetition
date anymore.

For instance, adding a task, with daily repetition, from 2019-10-16 to
2019-10-19.
If I try to edit it, making to finish on 2019-10-20, it doesn't work,
nothing happens on the UI.
Then I check apts file and see that the repetition is still on
the 2019-10-19.

Is there something that I'm missing on this repetition stuff?

Version: 4.5.0

Thanks
Fabio

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