Spaces on either side of links get stripped.

[eli]

Example:
hello https://www.google.com/ goodbye

What I typed to create the above (with spaces replaced with the text "SPACE"):

helloSPACEhttps://www.google.com/SPACEgoodbye

 

[eli]

Another example in this user's post

https://mangadex.org/thread/10062/spoilers-don-t-work-if-you-aren-t-logged-in

 

[Noms]

Yeah, previously reported, but I guess low priority
https://mangadex.org/thread/8945/formatting-of-auto-links-in-forum