Falta 'theme_fields' y fallo de sintaxis en rake db:migrate

Hola a todos,

Estoy intentando realizar una nueva instalación de Discourse v2.8.8 en Debian Buster (en Docker). Actualmente, las tareas de Sidekiq están fallando con el siguiente error relacionado con theme_fields:

2022-09-06 08:25:53.301 AEST [1205] ERROR:  relation "theme_fields" does not exist at character 454
2022-09-06 08:25:53.301 AEST [1205] STATEMENT:  SELECT a.attname, format_type(a.atttypid, a.atttypmod),
	       pg_get_expr(d.adbin, d.adrelid), a.attnotnull, a.atttypid, a.atttypmod,
	       c.collname, col_description(a.attrelid, a.attnum) AS comment
	  FROM pg_attribute a
	  LEFT JOIN pg_attrdef d ON a.attrelid = d.adrelid AND a.attnum = d.adnum
	  LEFT JOIN pg_type t ON a.atttypid = t.oid
 	  LEFT JOIN pg_collation c ON a.attcollation = c.oid AND a.attcollation <> t.typcollation
 	 WHERE a.attrelid = '"theme_fields"'::regclass
	   AND a.attnum > 0 AND NOT a.attisdropped
 	 ORDER BY a.attnum

Buscando en los foros, este es un error similar al del post Restore problem relation theme_fields does not exist; que desafortunadamente no tiene una resolución hasta ahora.

Investigando más a fondo, parece que esto está relacionado con el fallo de la tarea db:migrate en mi caso (es una suposición).
Ejecutar RAILS_ENV=test bin/rails db:migrate en una terminal devuelve un SyntaxError a continuación:

rails aborted!
SyntaxError: /app/lib/tasks/assets.rake:294: syntax error, unexpected '}', expecting `end'
/app/lib/tasks/assets.rake:306: syntax error, unexpected `end', expecting '}'
/app/lib/tasks/assets.rake:418: class definition in method body
  class Sprockets::Manifest
  ^~~~~~~~~~~~~~~~~~~~~~~~
/app/lib/tasks/assets.rake:430: syntax error, unexpected end-of-input, expecting `end'
/usr/local/bundle/ruby/2.7.0/gems/bootsnap-1.9.4/lib/bootsnap/load_path_cache/core_ext/kernel_require.rb:60:in `load'
/usr/local/bundle/ruby/2.7.0/gems/bootsnap-1.9.4/lib/bootsnap/load_path_cache/core_ext/kernel_require.rb:60:in `load'
/usr/local/bundle/ruby/2.7.0/gems/activesupport-6.1.6.1/lib/active_support/dependencies.rb:326:in `block in load'
/usr/local/bundle/ruby/2.7.0/gems/activesupport-6.1.6.1/lib/active_support/dependencies.rb:299:in `load_dependency'
/usr/local/bundle/ruby/2.7.0/gems/activesupport-6.1.6.1/lib/active_support/dependencies.rb:326:in `load'
/usr/local/bundle/ruby/2.7.0/gems/railties-6.1.6.1/lib/rails/engine.rb:675:in `block in run_tasks_blocks'
/usr/local/bundle/ruby/2.7.0/gems/railties-6.1.6.1/lib/rails/engine.rb:675:in `each'
/usr/local/bundle/ruby/2.7.0/gems/railties-6.1.6.1/lib/rails/engine.rb:675:in `run_tasks_blocks'
/usr/local/bundle/ruby/2.7.0/gems/railties-6.1.6.1/lib/rails/application.rb:528:in `run_tasks_blocks'
/usr/local/bundle/ruby/2.7.0/gems/railties-6.1.6.1/lib/rails/engine.rb:464:in `load_tasks'
/usr/local/bundle/ruby/2.7.0/gems/railties-6.1.6.1/lib/rails/railtie.rb:207:in `public_send'
/usr/local/bundle/ruby/2.7.0/gems/railties-6.1.6.1/lib/rails/railtie.rb:207:in `method_missing'
/app/Rakefile:9:in `<main>'
/usr/local/bundle/ruby/2.7.0/gems/bootsnap-1.9.4/lib/bootsnap/load_path_cache/core_ext/kernel_require.rb:60:in `load'
/usr/local/bundle/ruby/2.7.0/gems/bootsnap-1.9.4/lib/bootsnap/load_path_cache/core_ext/kernel_require.rb:60:in `load'
/usr/local/bundle/ruby/2.7.0/gems/railties-6.1.6.1/lib/rails/commands/rake/rake_command.rb:20:in `block in perform'
/usr/local/bundle/ruby/2.7.0/gems/railties-6.1.6.1/lib/rails/commands/rake/rake_command.rb:18:in `perform'
/usr/local/bundle/ruby/2.7.0/gems/railties-6.1.6.1/lib/rails/command.rb:50:in `invoke'
/usr/local/bundle/ruby/2.7.0/gems/railties-6.1.6.1/lib/rails/commands.rb:18:in `<main>'
/usr/local/bundle/ruby/2.7.0/gems/bootsnap-1.9.4/lib/bootsnap/load_path_cache/core_ext/kernel_require.rb:23:in `require'
/usr/local/bundle/ruby/2.7.0/gems/bootsnap-1.9.4/lib/bootsnap/load_path_cache/core_ext/kernel_require.rb:23:in `block in require_with_bootsnap_lfi'
/usr/local/bundle/ruby/2.7.0/gems/bootsnap-1.9.4/lib/bootsnap/load_path_cache/loaded_features_index.rb:105:in `register'
/usr/local/bundle/ruby/2.7.0/gems/bootsnap-1.9.4/lib/bootsnap/load_path_cache/core_ext/kernel_require.rb:22:in `require_with_bootsnap_lfi'
/usr/local/bundle/ruby/2.7.0/gems/bootsnap-1.9.4/lib/bootsnap/load_path_cache/core_ext/kernel_require.rb:31:in `require'
bin/rails:18:in `<main>'
(See full trace by running task with --trace)

Mirando el código lib/tasks/assets.rake (v2.8.8), parece que todos los end y } están correctamente colocados. Como no soy un experto en Ruby, podría suponer que quizás uno de los valores de las variables está rompiendo los cierres.

¿Qué podría haber salido mal?

Saludos cordiales,

¡Hola a todos!

¿Todavía se preguntan si alguien tiene alguna sugerencia/idea para este problema?

Gracias
Saludos cordiales,