Ruby on Rails Production with Heroku: Asset Precompile issue

I have an issue with the asset precompilation error when trying to push my app to Heroku.

ruby/concurrent/executor/ruby_thread_pool_executor.rb:341:in block (2 levels) in create_worker'/tmp/build_f0149c13/vendor/bundle/ruby/3.1.0/gems/concurrent-ruby-1.3.4/lib/concurrent-ruby/concurrent/executor/ruby_thread_pool_executor.rb:340:in catch'/tmp/build_f0149c13/vendor/bundle/ruby/3.1.0/gems/concurrent-ruby-1.3.4/lib/concurrent-ruby/concurrent/executor/ruby_thread_pool_executor.rb:340:in block in create_worker'Tasks: TOP => assets:precompile(See full trace by running task with --trace)

!! Precompiling assets failed.!! Push rejected, failed to compile Ruby app.! Push failed

-----> Installing node-v22.11.0-linux-x64-----> Detecting rake tasks-----> Preparing app for Rails asset pipelineRunning: rake assets:precompilerake aborted!SassC::SyntaxError: Error: overloaded function rgba given wrong number of argumentson line 1:11446 of stdin>> -resize-helper{background:#555;background:rgba(0 0 0%);border:1px;border-rad------------------------------------------^stdin:1

I don't understand the origin of the issue, does anyone have a clue?

I've tried asset:precompileresetting assets,config.assets.initialize_on_precompile = false,checking gems updates,

The major issue seems to be the resize-helper{background:#555;background:rgba(0 0 0%);border:1px;border-rad But in any case I double checked my code and can't find any occurrences of this, it must come from a gem or something else.