Can’t edit redirect slug

Hi,

We run a booking site with a lot of musical acts.
From time to time we need to delete acts, these deleted pages we redirect to their category pages.

When we trash an act, example:
/live-entertainment/luize-chris-queensland-duo/

Your plugin prompts us to add a redirect in, which we do to a category page, example:
/entertainment/duos-trios/brisbane/

But you plugin is adding “__trashed” at the end of the original URL, example

/live-entertainment/luize-chris-queensland-duo__trashed/

which we can see in the redirect manager.

This means that /live-entertainment/luize-chris-queensland-duo/ does not redirect, as it does not have __trashed at the end.

We were able to go into the Redirect Manager and ‘edit’ the entry, removing “__trashed” from the end.

But recently when we save the original URL it does not update and remains with “__trashed” at the end.

How do we:

a. Not have “__trashed” auto-populate at the end of the slug
b. Successfully edit redirects and have them stick?

Thanks!