With https://gerrit.wikimedia.org/r/c/mediawiki/core/+/554417/ (T196669) the linking syntax was changed from
[{{fullurl:{{#Special:Log}}/delete|page={{FULLPAGENAMEE}}}} deletion log]to
[{{fullurl:{{#Special:Log}}/delete|page=$1}} deletion log]This breaks the link to the deletion log for page names with a space in it.
Example: https://commons.wikimedia.org/w/index.php?title=File:Gunpla_model_packed.jpg&oldid=433479543 (should be seen logged out)
Probably also an issue the the other messages changed with https://gerrit.wikimedia.org/r/c/mediawiki/core/+/554417/ . But not tested by me for now.