REST-API failed(redmine-tags,projects.json)

[y503unavailable]

REST-APIが失敗する場合がある(projects.json)

Started GET "/redmine/projects.json?key=APIKEY

Processing by ProjectsController#index as JSON
Parameters: {"offset"=>"0", "limit"=>"100", "key"=>"****"}
Current user: admin (id=1)
STATEMENT (projects.status IN ('1'))
Rendering projects/index.api.rsb
Rendered projects/index.api.rsb (106.5ms)
Completed 500 Internal Server Error in 117ms (ActiveRecord: 2.7ms)

ActionView::Template::Error (undefined method `render_api_redmine_tags' for #<#Class:0x00007f57d32f6098:0x00007f57d1e9cc28>
Did you mean? render_api_includes):
13: render_api_custom_values project.visible_custom_field_values, api
14: render_api_includes(project, api)
15:
16: api.created_on project.created_on
17: api.updated_on project.updated_on
18: end
19: end

app/views/projects/index.api.rsb:16:in block (4 levels) in _app_views_projects_index_api_rsb___469728308491098654_12918860' lib/redmine/views/builders/structure.rb:73:in method_missing'
app/views/projects/index.api.rsb:3:in block (3 levels) in _app_views_projects_index_api_rsb___469728308491098654_12918860' app/views/projects/index.api.rsb:2:in each'
app/views/projects/index.api.rsb:2:in block (2 levels) in _app_views_projects_index_api_rsb___469728308491098654_12918860' lib/redmine/views/builders/structure.rb:34:in array'
app/views/projects/index.api.rsb:1:in block in _app_views_projects_index_api_rsb___469728308491098654_12918860' lib/redmine/views/builders.rb:36:in for'
app/views/projects/index.api.rsb:1:in _app_views_projects_index_api_rsb___469728308491098654_12918860' plugins/redmine_per_project_formatting/lib/redmine_per_project_formatting/application_controller_patch.rb:24:in block in change_text_formatting'
plugins/redmine_per_project_formatting/lib/redmine_per_project_formatting/setting_patch.rb:19:in within_text_formatting' plugins/redmine_per_project_formatting/lib/redmine_per_project_formatting/application_controller_patch.rb:23:in change_text_formatting'
lib/redmine/sudo_mode.rb:61:in `sudo_mode'

[y503unavailable]

エラー時のログ上で関連する redmine_per_project_formattingとredmine_tagsプラグインを一時的に除外して切り分けた。
結果的に、redmine_tagsプラグインを除外する（pluginsから移動して再起動）と、RESTAPIが正常に動作することを確認した。
githubに同一状況のissueがあり、
ixti/redmine_tags#222

下記の lib/redmine_tags/patches/add_helpers_for_issue_tags_patch.rb を1行修正することで動作した。
yzzy/redmine_tags@4c3a04d