Issues encountered with promoted links list:
Tiles view will break if a user edits the promoted links web part while on its system page or if it is inserted on a page.
Editing the web part and changing the 'view' from Tiles will give you warning message, but you are still allowed to pick another view. After saving the changes to the web part the Tiles view never works again. This can also break the All Items view depending on what view the promoted links web part is using when it is edited.
Warning message: "Switching to a different view removes changes you have made to this view, and may disable Web Part connections that depend on columns in this view."
Editing the promoted links web part after it is inserted on the page will break if you pick summary toolbar. You will receive an error message of 'Sorry, something went wrong cannot complete this action".
Can the tile view be restored somehow after it is wiped out by editing the promoted links web part to change the view versus using what is in the ribbon?