"Add labels to an issue" API doesn't work on v4.39.0

[SIkebe]

Issue

Impacted version: 4.39.0

Deployment mode: standalone app

Problem description:
Add labels to an issue API works on GitBucket v4.38.4 but not on v4.39.0. A same request working on v4.38.4 returns just an empty array on v4.39.0.

Example of failed API request:

curl -L \
  -X POST \
  -H "Content-Type: application/json" \
  -H "Authorization: token AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA" \
  http://localhost:8080/api/v3/repos/root/demo/issues/2/labels \
  -d '{"labels":["bug","enhancement"]}'

[takezoe]

Maybe this? #3226

Input JSON schema was wrong in 4.38.4 or before. I think this request didn't work on 4.38.4 but works on 4.39.0. 🤔

curl -L \
  -X POST \
  -H "Content-Type: application/json" \
  -H "Authorization: token AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA" \
  http://localhost:8080/api/v3/repos/root/demo/issues/2/labels \
  -d '{"labels":["bug","enhancement"]}'

[takezoe]

@SIkebe Any thoughts?