[BUG] Not receiving any emails with setting "Only Email on Mention"

[strangezakary]

• Gitea version (or commit ref): 1.13 rc1
• Git version: 2.28.0
• Operating system: Ubuntu 18.04 x64, Release downloaded from Gitea.io, Gitea is currently running as a service, service file is very similar to the example service file in docs
• Database (use [x]):
  • PostgreSQL
  • MySQL
  • MSSQL
  • [* ] SQLite
• Can you reproduce the bug at https://try.gitea.io:
  • [ *] Yes (https://try.gitea.io/zak/dsadsadsadas/issues/1#issuecomment-69976)
  • No
• Log gist:
  Logs don't show anything really, no failed to send an email or any of that.

Description

After setting the DEFAULT_EMAIL_NOTIFICATIONS setting to onmention, and having all current devs update their already existing email setting to onmention. No one is receiving emails now even if they were mentioned. Prior to this everyone who was watching the repo was receiving emails. This wasn't ideal for us so we switched over to mention only, and now we get no emails at all. This seems very similar to #12774 just a different version. Additionally, if I use the send testing email button, I receive an email. So it seems everything related to mail is configured correctly

Thanks in advance.