Location of wkhtmltopdf unknown when running on heroku

[AleFons]

Hello, I've recently swapped to using this gem because of Heroku's limitations on slug size and have been running into a problem where it seems WickedPdf can't find the gem. I don't have an initializer for WickedPdf, because I don't need any extra settings and the one place I do use WickedPdf is just to generate a pdf from a string, that's it.

Ruby 3.3.5
Heroku 24
wkhtmltopdf-heroku 3.0.0
wicked_pdf 2.8.0

Any ideas?

Edit: Mysteriously, after a week or two of deploying, redeploying and resetting the server, it started working.

Second edit: Just the same way it worked, it mysteriously stopped once again. Attempting to create a initializer file for wicked_pdf doesn't change anything.