Trailing Dash (or Trailing Hyphen) Issue

[Coodie]

All URLs with an added trailing dash or hyphen still function.

Example: domain.com/page is my URL, however domain.com/page- works and does not redirect when the actual URL of the page.
This also happens with trailing slash. Example:
domain.com/page/ is the URL, domain.com/page-/ also works.

The canonical URL in the page source correctly shows the URL without the dash/hyphen (-). But this doesn't prevent the page from showing up in search results, so we're getting data in our analytics showing traffic to both URLs. Here's a screenshot showing a list of URLs in our analytics account for one site. All of these URLs should not have the trailing dash.

I have tried adding this line to my htaccess

RewriteRule ^(.*)-$ $1 [QSA,R=301,L]  # Redirect requests to hyphen-terminated URLs

And while that does redirect the URL so it doesn't have the trailing dash, it causes a redirect loop when trying to access wp-admin. So that's not an option.

I don't know if this is specific to WP 6+ versions or it was something that's been happening for a while, but it should be addressed.

Live example
Real URL:
​https://webdevhandyman.com/services/custom-wordpress-theme
Working URLs with trailing dashes that should redirect back to the actual URL or should at the very least show as 404:
​https://webdevhandyman.com/services/custom-wordpress-theme-
​https://webdevhandyman.com/services/custom-wordpress-theme--
(and it doesn't matter how many dashes you add, they all work)

[SergeyBiryukov]

Hi there, welcome to WordPress Trac!

Thanks for the report, we're already tracking this issue in #14773.