Error message when update fails due to signature mismatch

[matchboxbananasynergy]

Currently, if you have an installed app that is also on Accrescent which has a different signature than the one the developers use for the Accrescent release, the update will not do anything; no error or message to indicate the update failed or why, which can confuse users.

It's unclear to me whether a regular app like Accrescent can know whether it's unable to update an app due to the one already being installed having an incompatible signature, but if that's possible, there should be an error explaining that, preferably with a "Learn more" link that leads to the website which explains how this works in more detail on the Accrescent website.

EDIT: It seems that apps can in fact detect this, as it was reported to me that Neo Store provides an error message like this as shown in the screenshot below; so this should be possible.