[Bug] Scoreboard placeholder no longer works in recent dev builds

Summary

Describe the bug encountered in detail.

Steps to reproduce

Provide a full set of steps used to reproduce the bug, including links to SEPARATE Pastebin pastes for each relevant configuration file.

Current behavior

Default placeholder doesn't evaluate, worked on 5.5.2, broken on 5.6 builds and most recent dev (4969)

bug_test:
  Skills:
  - message{m="caster team id is <caster.score.team_id>"} @self

/scoreboard objectives add team_id dummy /scoreboard players set <player_name> team_id 1

Placeholder evaluates to 0