I've had a pdf printing issue with Thunderbird, Firefox, and Librewolf for some time and cursed my way through web pages looking for answers. I had come across the same issue many years ago and had found a value in 'settings' that I needed to change. Do you think I can recall or find that setting now? NO I couldn't. I deleted the 'saved' printing instructions but that made zero diff.
In the end, frustrated and tired of reading blogs and useless answers, I installed a free-to-use FoxIt (you need to look for it on their website) on my Win10 machine and made it the default pdf viewer. Works a treat, no issues at all.
I will slowly work to replace Firefox (the traitors) with LibreWolf as well.
Thunderbird still does the job so it's safe for now (they better not try to integrate AI (like FoxIt has - though it up to the user to use it or not).