This was originally reported by @Johannnes89 in T398423#11082161.

Background

• Since T398423: Temp Accounts: Special:Log/newusers is flooded with temp accounts making it harder to monitor abuse, the creations of temp. accounts are hidden by default in logs, with option to show them anyway.
• When opening the Special:Log page using a link that included temp. performer's username, the form includes two seemingly contradictory options:
  • Exclude temporary accounts creation
  • Show additional logs: User creation log
• When in such state, there's only one log entry that will get filtered out, so the reasoning about the log being spammed (from T398423) doesn't hold anymore.

Proposal

When the form is loaded through a URL, which includes the performer's username (i.e., issubmitted != 1 && user != ''), don't filter out temporary user creations by default.