Not all branches shown in branch pagination

[eNBeWe]

• Gitea version (or commit ref): 1.15.0
• Git version: 2.25.1
• Operating system:
  • Provided binary
  • Systemd
  • Ubuntu 20.04.3
  • No docker
• Database (use [x]):
  • PostgreSQL
  • MySQL
  • MSSQL
  • SQLite
• Can you reproduce the bug at https://try.gitea.io:
  • Yes (https://try.gitea.io/arandomer/BranchPagination)
  • No
• Log gist:

Description

• When I create 20 branches (in addition to the default branch), the branch page of the repository doesn't show the pagination bar
  and the last branch is not shown.
• I can manually navigate to the second page by appending ?page=2 to the url and the branch is shown.
• Similar, if I add 20 more branches, the pagination bar is missing the last (third) page

Screenshots

[eNBeWe]

If I push another branch, the next page is shown in the pagination bar. That means on the last page there need to be two branches to be shown.