App Version (from "Chrome Settings > About Chrome"): 71.0.3578.89
iOS Version: 11.4.1
Device: iPhone X

Steps to reproduce: 
1) Open iOS Chrome to https://www.raspberrypi.org/documentation/usage/gpio/
2) Press "share" button on the right of the omnibox.
3) Select "Copy".
4) Paste the link in any text field on iOS to observe what the link is.

Observed behavior: 
Link copied to the clipboard should be https://www.raspberrypi.org/documentation/usage/gpio/

Expected behavior: 
Link copied is https://www.raspberrypi.org/

Frequency: 
100%.
Only repros on certain pages - for instance:
https://www.raspberrypi.org/documentation/usage/gpio/ - bug repros
https://www.raspberrypi.org/documentation/usage/ - bug repros
https://www.raspberrypi.org/documentation/ - bug repros
https://www.raspberrypi.org/blog/ - bug does not repro
https://www.raspberrypi.org/downloads/ - bug does not repro
("repro" indicates that the link copied is just the domain https://www.raspberrypi.org, whereas "does not repro" indicates that the link copied is the correct link)